标签：read names fine visit dep scanf puts cin begin
2018-12-29起，将各类模板都保存至此处，各位可以对着这里背板子（有些代码可能借鉴了其他blog，请见谅）
目前已借鉴的博客：（大为感谢）
1. https://www.cnblogs.com/TheRoadToTheGold/p/6254255.html
2. https://www.cnblogs.com/chinhhh/p/7965433.html
3. https://www.luogu.org/blog/41868/soutionp2142
（有错的话请各路神犇指教）
1. 平衡树treap：
1 #include <cstdio> 2 #include <cstdlib> 3 const int maxn = 100005; 4 struct node 5 { 6 node *s[2]; 7 int k, f, siz; 8 node() {} 9 node(int w, node *son) 10 { 11 s[0] = s[1] = son; 12 k = w; 13 f = rand(); 14 siz = 1; 15 } 16 void pushup() 17 { 18 siz = s[0]->siz + s[1]->siz + 1; 19 } 20 } nil, base[maxn]; 21 typedef node *P_node; 22 P_node null, len, Root; 23 void treap_init() 24 { 25 nil = node(0, NULL); 26 null = &nil; 27 null->s[0] = null->s[1] = null; 28 null->siz = 0; 29 len = base; 30 Root = null; 31 } 32 P_node newnode(int x) 33 { 34 *len = node(x, null); 35 return len++; 36 } 37 P_node merge(P_node a, P_node b) 38 { 39 if (a == null) 40 return b; 41 if (b == null) 42 return a; 43 if (a->f > b->f) { 44 a->s[1] = merge(a->s[1], b); 45 a->pushup(); 46 return a; 47 } 48 b->s[0] = merge(a, b->s[0]); 49 b->pushup(); 50 return b; 51 } 52 void split(P_node x, int k, P_node &l, P_node &r) 53 { 54 if (x == null) 55 { 56 l = r = null; 57 return; 58 } 59 if (x->k <= k) 60 { 61 l = x; 62 split(l->s[1], k, l->s[1], r); 63 } 64 else 65 { 66 r = x; 67 split(r->s[0], k, l, r->s[0]); 68 } 69 x->pushup(); 70 } 71 void Insert(int k) 72 { 73 P_node l, r; 74 split(Root, k, l, r); 75 Root = merge(merge(l, newnode(k)), r); 76 } 77 void Erase(int k) 78 { 79 P_node l, mid, r; 80 split(Root, k - 1, l, r); 81 split(r, k, mid, r); 82 Root = merge(l, merge(merge(mid->s[0], mid->s[1]), r)); 83 } 84 int Kth(P_node x, int k) 85 { 86 if (k <= x->s[0]->siz) 87 return Kth(x->s[0], k); 88 else if (k > x->s[0]->siz + 1) 89 return Kth(x->s[1], k - x->s[0]->siz - 1); 90 return x->k; 91 } 92 int get_edge(P_node x, int d) 93 { 94 while (x->s[d] != null) x = x->s[d]; 95 return x->k; 96 } 97 int q; 98 inline int red() 99 { 100 int tot = 0, f = 1; 101 char ch = getchar(); 102 while (ch < ‘0‘ || ‘9‘ < ch) 103 { 104 if (ch == ‘-‘) 105 f = -f; 106 ch = getchar(); 107 } 108 while (‘0‘ <= ch && ch <= ‘9‘) tot = tot * 10 + ch - 48, ch = getchar(); 109 return tot * f; 110 } 111 int main() 112 { 113 treap_init(); 114 q = red(); 115 while (q--) 116 { 117 int c = red(); 118 if (c == 1) 119 Insert(red()); 120 else if (c == 2) 121 Erase(red()); 122 else if (c == 3) 123 { 124 int k = red(); 125 P_node l, r; 126 split(Root, k - 1, l, r); 127 printf("%d\n", l->siz + 1); 128 Root = merge(l, r); 129 } 130 else if (c == 4) 131 printf("%d\n", Kth(Root, red())); 132 else if (c == 5) 133 { 134 int k = red(); 135 P_node l, r; 136 split(Root, k - 1, l, r); 137 printf("%d\n", get_edge(l, 1)); 138 Root = merge(l, r); 139 } 140 else 141 { 142 int k = red(); 143 P_node l, r; 144 split(Root, k, l, r); 145 printf("%d\n", get_edge(r, 0)); 146 Root = merge(l, r); 147 } 148 } 149 return 0; 150 }
2. 线段树（带lazy标记）
1 #include<iostream> 2 #include<cstdio> 3 #define MAXN 1000001 4 #define ll long long 5 using namespace std; 6 unsigned ll n, m, a[MAXN], ans[MAXN << 2], tag[MAXN << 2]; 7 inline ll ls(ll x) 8 { 9 return x << 1; 10 } 11 inline ll rs(ll x) 12 { 13 return x << 1 | 1; 14 } 15 void scan() 16 { 17 cin >> n >> m; 18 for (ll i = 1; i <= n; i++) 19 scanf("%lld", &a[i]); 20 } 21 inline void push_up(ll p) 22 { 23 ans[p] = ans[ls(p)] + ans[rs(p)]; 24 } 25 void build(ll p, ll l, ll r) 26 { 27 tag[p] = 0; 28 if (l == r) { ans[p] = a[l]; return; } 29 ll mid = (l + r) >> 1; 30 build(ls(p), l, mid); 31 build(rs(p), mid + 1, r); 32 push_up(p); 33 } 34 inline void f(ll p, ll l, ll r, ll k) 35 { 36 tag[p] = tag[p] + k; 37 ans[p] = ans[p] + k * (r - l + 1); 38 } 39 inline void push_down(ll p, ll l, ll r) 40 { 41 ll mid = (l + r) >> 1; 42 f(ls(p), l, mid, tag[p]); 43 f(rs(p), mid + 1, r, tag[p]); 44 tag[p] = 0; 45 } 46 inline void update(ll nl, ll nr, ll l, ll r, ll p, ll k) 47 { 48 if (nl <= l && r <= nr) 49 { 50 ans[p] += k * (r - l + 1); 51 tag[p] += k; 52 return; 53 } 54 push_down(p, l, r); 55 ll mid = (l + r) >> 1; 56 if (nl <= mid)update(nl, nr, l, mid, ls(p), k); 57 if (nr > mid) update(nl, nr, mid + 1, r, rs(p), k); 58 push_up(p); 59 } 60 ll query(ll q_x, ll q_y, ll l, ll r, ll p) 61 { 62 ll res = 0; 63 if (q_x <= l && r <= q_y)return ans[p]; 64 ll mid = (l + r) >> 1; 65 push_down(p, l, r); 66 if (q_x <= mid)res += query(q_x, q_y, l, mid, ls(p)); 67 if (q_y > mid) res += query(q_x, q_y, mid + 1, r, rs(p)); 68 return res; 69 } 70 int main() 71 { 72 ll a1, b, c, d, e, f; 73 scan(); 74 build(1, 1, n); 75 while (m--) 76 { 77 scanf("%lld", &a1); 78 switch (a1) 79 { 80 case 1: { 81 scanf("%lld%lld%lld", &b, &c, &d); 82 update(b, c, 1, n, 1, d); 83 break; 84 } 85 case 2: { 86 scanf("%lld%lld", &e, &f); 87 printf("%lld\n", query(e, f, 1, n, 1)); 88 break; 89 } 90 } 91 } 92 return 0; 93 }
3. 并查集
#include<iostream> using namespace std; const int N = 10000; int n, m; int fa[N], size[N]; inline void init() { for (int i = 1; i <= n; i++)fa[i] = i, size[i] = 1; } inline int find(int x) { return x == fa[x] ? x : fa[x] = find(fa[x]); } inline void merge(int x, int y) { int xx = find(x), yy = find(y); if (size[xx] < size[yy])swap(xx, yy); fa[yy] = xx; size[xx] += size[yy]; } inline bool both(int x, int y) { if (find(x) == find(y)) return 1; else return 0; } int main() { cin >> n >> m; init(); for (int i = 1; i <= m; i++) { int a, b, tmp; cin >> tmp; if (tmp == 1) { cin >> a >> b; merge(a, b); } if (tmp == 2) { cin >> a >> b; if (both(a, b)) cout << ‘Y‘ << endl; else cout << ‘N‘ << endl; } } return 0; }
4. 快速排序（sort也不错）
#include<bits/stdc++.h> using namespace std; void qsort(int, int); int a[100001], sum; int main() { int n, i; cin >> n; for (i = 1; i <= n; i++) cin >> a[i]; qsort(1, n); for (i = 1; i <= n; i++) cout << a[i] << " "; cout << endl; } void qsort(int l, int r) { int i, j, mid, p; i = l; j = r; mid = a[(l + r) / 2]; do { while (a[i] < mid) i++; while (a[j] > mid) j--; if (i <= j) { p = a[i]; a[i] = a[j]; a[j] = p; sum++; i++; j--; } } while (i <= j); if (l < j) qsort(l, j); if (i < r) qsort(i, r); }
5. 树剖
#include <cstdio> #include <algorithm> #include <cctype> using namespace std; #define rint register int #define mem(a,b) memset(a,(b),sizeof(a)) #define temp template<typename T> typedef long long LL; temp inline void read(T &x) { x = 0; T w = 1, ch = getchar(); while (!isdigit(ch) && ch != ‘-‘) ch = getchar(); if (ch == ‘-‘) w = -1, ch = getchar(); while (isdigit(ch)) { x = (x << 3) + (x << 1) + (ch^‘0‘); ch = getchar(); } x = x * w; } #define mid ((l+r)>>1) #define lson rt<<1,l,mid #define rson rt<<1|1,mid+1,r #define len (r-l+1) const int maxn = 200000 + 10; int n, m, r, mod; int e, beg[maxn], nex[maxn], to[maxn], w[maxn], wt[maxn]; int a[maxn << 2], laz[maxn << 2]; int son[maxn], id[maxn], fa[maxn], cnt, dep[maxn], siz[maxn], top[maxn]; int res = 0; inline void add(int x, int y) { to[++e] = y; nex[e] = beg[x]; beg[x] = e; } inline void pushdown(int rt, int lenn) { laz[rt << 1] += laz[rt]; laz[rt << 1 | 1] += laz[rt]; a[rt << 1] += laz[rt] * (lenn - (lenn >> 1)); a[rt << 1 | 1] += laz[rt] * (lenn >> 1); a[rt << 1] %= mod; a[rt << 1 | 1] %= mod; laz[rt] = 0; } inline void build(int rt, int l, int r) { if (l == r) { a[rt] = wt[l]; if (a[rt] > mod) a[rt] %= mod; return; } build(lson); build(rson); a[rt] = (a[rt << 1] + a[rt << 1 | 1]) % mod; } inline void query(int rt, int l, int r, int L, int R) { if (L <= l && r <= R) { res += a[rt]; res %= mod; return; } else { if (laz[rt]) pushdown(rt, len); if (L <= mid) query(lson, L, R); if (R > mid) query(rson, L, R); } } inline void update(int rt, int l, int r, int L, int R, int k) { if (L <= l && r <= R) { laz[rt] += k; a[rt] += k * len; } else { if (laz[rt]) pushdown(rt, len); if (L <= mid) update(lson, L, R, k); if (R > mid) update(rson, L, R, k); a[rt] = (a[rt << 1] + a[rt << 1 | 1]) % mod; } } inline int qrange(int x, int y) { int ans = 0; while (top[x] != top[y]) { if (dep[top[x]] < dep[top[y]]) swap(x, y); res = 0; query(1, 1, n, id[top[x]], id[x]); ans += res; ans %= mod; x = fa[top[x]]; } if (dep[x] > dep[y]) swap(x, y); res = 0; query(1, 1, n, id[x], id[y]); ans += res; return ans %= mod; } inline void updrange(int x, int y, int k) { k %= mod; while (top[x] != top[y]) { if (dep[top[x]] < dep[top[y]]) swap(x, y); update(1, 1, n, id[top[x]], id[x], k); x = fa[top[x]]; } if (dep[x] > dep[y]) swap(x, y); update(1, 1, n, id[x], id[y], k); } inline int qson(int x) { res = 0; query(1, 1, n, id[x], id[x] + siz[x] - 1); return res; } inline void updson(int x, int k) { update(1, 1, n, id[x], id[x] + siz[x] - 1, k); } inline void dfs1(int x, int f, int deep) { dep[x] = deep; fa[x] = f; siz[x] = 1; int maxson = -1; for (rint i = beg[x]; i; i = nex[i]) { int y = to[i]; if (y == f) continue; dfs1(y, x, deep + 1); siz[x] += siz[y]; if (siz[x] > maxson) son[x] = y, maxson = siz[y]; } } inline void dfs2(int x, int topf) { id[x] = ++cnt; wt[cnt] = w[x]; top[x] = topf; if (!son[x]) return; dfs2(son[x], topf); for (rint i = beg[x]; i; i = nex[i]) { int y = to[i]; if (y == fa[x] || y == son[x]) continue; dfs2(y, y); } } int main() { read(n); read(m); read(r); read(mod); for (rint i = 1; i <= n; i++) read(w[i]); for (rint i = 1; i < n; i++) { int a, b; read(a); read(b); add(a, b); add(b, a); } dfs1(r, 0, 1); dfs2(r, r); build(1, 1, n); while (m--) { int k, x, y, z; read(k); if (k == 1) { read(x); read(y); read(z); updrange(x, y, z); } else if (k == 2) { read(x); read(y); printf("%d\n", qrange(x, y)); } else if (k == 3) { read(x); read(y); updson(x, y); } else { read(x); printf("%d\n", qson(x)); } } // getchar(); // getchar(); }
6. tarjan强联通分量
1 #include <cstdio> 2 #include <algorithm> 3 #include <cstring> 4 #include <iostream> 5 using namespace std; 6 struct node 7 { 8 int v, next; 9 }edge[1001]; 10 int DFN[1001], LOW[1001]; 11 int stack[1001], heads[1001], visit[1001], cnt, tot, index; 12 void add(int x, int y) 13 { 14 edge[++cnt].next = heads[x]; 15 edge[cnt].v = y; 16 heads[x] = cnt; 17 return; 18 } 19 void tarjan(int x) 20 { 21 DFN[x] = LOW[x] = ++tot; 22 stack[++index] = x; 23 visit[x] = 1; 24 for (int i = heads[x]; i != -1; i = edge[i].next) 25 { 26 if (!DFN[edge[i].v]) 27 { 28 tarjan(edge[i].v); 29 LOW[x] = min(LOW[x], LOW[edge[i].v]); 30 } 31 else if (visit[edge[i].v]) 32 { 33 LOW[x] = min(LOW[x], DFN[edge[i].v]); 34 } 35 } 36 if (LOW[x] == DFN[x]) 37 { 38 do 39 { 40 printf("%d ", stack[index]); 41 visit[stack[index]] = 0; 42 index--; 43 } while (x != stack[index + 1]); 44 printf("\n"); 45 } 46 return; 47 } 48 int main() 49 { 50 memset(heads, -1, sizeof(heads)); 51 int n, m; 52 cin >> n >> m; 53 int x, y; 54 for (int i = 1; i <= m; i++) 55 { 56 cin >> x >> y; 57 add(x, y); 58 } 59 for (int i = 1; i <= n; i++) 60 if (!DFN[i]) tarjan(i); 61 //getchar(); 62 //getchar(); 63 //getchar(); 64 return 0; 65 }
7. 最大流（Ford，EK，Dinic，ISAP）
1 #include <iostream> 2 #include <cstdio> 3 #include <cstring> 4 #include <vector> 5 #include <queue> 6 using namespace std; 7 struct edge 8 { 9 int to, cap, rev; 10 }; 11 const int maxn = 10001, INF = 0x7F7F7F7F; 12 int n, m; 13 vector <edge> G[maxn + 1]; 14 edge make_edge(int to, int cap, int rev) 15 { 16 edge x; 17 x.to = to, x.cap = cap, x.rev = rev; 18 return x; 19 } 20 void add_edge(int from, int to, int cap) 21 { 22 G[from].push_back(make_edge(to, cap, G[to].size())); 23 G[to].push_back(make_edge(from, 0, G[from].size() - 1)); 24 } 25 void init() 26 { 27 for (int i = 1; i <= m; i++) 28 { 29 int u, v, w; 30 scanf("%d%d%d", &u, &v, &w); 31 add_edge(u, v, w); 32 } 33 } 34 namespace Ford_Fulkerson 35 { 36 bool used[maxn + 1]; 37 int dfs(int x, int t, int f) 38 { 39 if (x == t) return f; 40 used[x] = true; 41 for (int i = 0; i < G[x].size(); i++) 42 { 43 edge &e = G[x][i]; 44 if (!used[e.to] && e.cap > 0) 45 { 46 int d = dfs(e.to, t, min(f, e.cap)); 47 if (d > 0) 48 { 49 e.cap -= d; 50 G[e.to][e.rev].cap += d; 51 return d; 52 } 53 } 54 } 55 return 0; 56 } 57 int max_flow(int s, int t) 58 { 59 int flow = 0; 60 for (;;) 61 { 62 memset(used, 0, sizeof(used)); 63 int f = dfs(s, t, INF); 64 if (f == 0) return flow; 65 flow += f; 66 } 67 } 68 } 69 namespace Edmond_Karp 70 { 71 bool vis[maxn + 1]; 72 int prev[maxn + 1]; 73 int pree[maxn + 1]; 74 void bfs(int s) 75 { 76 memset(vis, 0, sizeof(vis)); 77 memset(prev, -1, sizeof(prev)); 78 memset(pree, -1, sizeof(prev)); 79 queue <int> q; 80 vis[s] = true; 81 q.push(s); 82 while (!q.empty()) 83 { 84 int x = q.front(); 85 q.pop(); 86 for (int i = 0; i < G[x].size(); i++) 87 { 88 edge &e = G[x][i]; 89 if (e.cap > 0 && !vis[e.to]) 90 { 91 prev[e.to] = x; 92 pree[e.to] = i; 93 vis[e.to] = true; 94 q.push(e.to); 95 } 96 } 97 } 98 } 99 100 int max_flow(int s, int t) 101 { 102 int flow = 0; 103 for (;;) 104 { 105 bfs(s); 106 if (!vis[t]) return flow; 107 int d = INF; 108 for (int i = t; prev[i] != -1; i = prev[i]) 109 d = min(d, G[prev[i]][pree[i]].cap); 110 for (int i = t; prev[i] != -1; i = prev[i]) 111 { 112 edge &e = G[prev[i]][pree[i]]; 113 e.cap -= d; 114 G[e.to][e.rev].cap += d; 115 } 116 flow += d; 117 } 118 } 119 } 120 namespace Dinic 121 { 122 int level[maxn + 1]; 123 int iter[maxn + 1]; 124 void bfs(int s) 125 { 126 memset(level, -1, sizeof(level)); 127 queue <int> q; 128 level[s] = 0; 129 q.push(s); 130 while (!q.empty()) 131 { 132 int x = q.front(); 133 q.pop(); 134 for (int i = 0; i < G[x].size(); i++) 135 { 136 edge &e = G[x][i]; 137 if (e.cap > 0 && level[e.to] < 0) 138 { 139 level[e.to] = level[x] + 1; 140 q.push(e.to); 141 } 142 } 143 } 144 } 145 int dfs(int x, int t, int f) 146 { 147 if (x == t) return f; 148 for (int &i = iter[x]; i < G[x].size(); i++) 149 { 150 edge &e = G[x][i]; 151 if (e.cap > 0 && level[e.to] > level[x]) 152 { 153 int d = dfs(e.to, t, min(f, e.cap)); 154 if (d > 0) 155 { 156 e.cap -= d; 157 G[e.to][e.rev].cap += d; 158 return d; 159 } 160 } 161 } 162 return 0; 163 } 164 int max_flow(int s, int t) 165 { 166 int flow = 0; 167 for (;;) 168 { 169 bfs(s); 170 if (level[t] < 0) return flow; 171 memset(iter, 0, sizeof(iter)); 172 int f; 173 while ((f = dfs(s, t, INF)) > 0) 174 flow += f; 175 } 176 } 177 } 178 namespace ISAP 179 { 180 int gap[maxn + 1]; 181 int iter[maxn + 1]; 182 int level[maxn + 1]; 183 void bfs(int t) 184 { 185 memset(gap, 0, sizeof(gap)); 186 memset(level, -1, sizeof(level)); 187 queue <int> q; 188 level[t] = 1; 189 gap[level[t]] = 1; 190 q.push(t); 191 while (!q.empty()) 192 { 193 int x = q.front(); 194 q.pop(); 195 for (int i = 0; i < G[x].size(); i++) 196 { 197 edge &e = G[x][i]; 198 if (level[e.to] < 0) { 199 level[e.to] = level[x] + 1; 200 gap[level[e.to]]++; 201 q.push(e.to); 202 } 203 } 204 } 205 } 206 207 int dfs(int x, int s, int t, int f) 208 { 209 if (x == t) return f; 210 int flow = 0; 211 for (int &i = iter[x]; i < G[x].size(); i++) 212 { 213 edge &e = G[x][i]; 214 if (e.cap > 0 && level[x] == level[e.to] + 1) 215 { 216 int d = dfs(e.to, s, t, min(f - flow, e.cap)); 217 e.cap -= d; 218 G[e.to][e.rev].cap += d; 219 flow += d; 220 if (f == flow) return f; 221 } 222 } 223 224 gap[level[x]]--; 225 if (gap[level[x]] == 0) 226 level[s] = n + 1; 227 iter[x] = 0; 228 gap[++level[x]]++; 229 return flow; 230 } 231 int max_flow(int s, int t) 232 { 233 int flow = 0; 234 bfs(t); 235 memset(iter, 0, sizeof(iter)); 236 while (level[s] <= n) 237 flow += dfs(s, s, t, INF); 238 return flow; 239 } 240 } 241 int main() 242 { 243 int s, t; 244 scanf("%d%d%d%d", &n, &m, &s, &t); 245 init(); 246 printf("%d\n", ISAP::max_flow(s, t)); 247 return 0; 248 }
8. 筛法（伪筛）
1 #include <cstdio> 2 #include <cmath> 3 #include <cstdlib> 4 #include <algorithm> 5 #include <cstring> 6 using namespace std; 7 #define maxn 1000000+10 8 bool a[maxn]; 9 int n; 10 inline void cal_prime() 11 { 12 memset(a, true, sizeof(a)); 13 for (int i = 2; i <= n; i++) 14 { 15 if (!a[i]) continue; 16 for (int j = i * 2; j <= n; j += i) 17 a[j] = false; 18 } 19 } 20 int main() 21 { 22 scanf("%d", &n); 23 int num; 24 scanf("%d", &num); 25 cal_prime(); 26 a[0] = false; 27 a[1] = false; 28 for (int i = 1; i <= num; i++) 29 { 30 int cmp; 31 scanf("%d", &cmp); 32 if (a[cmp]) printf("Yes\n"); 33 else printf("No\n"); 34 } 35 printf("no"); 36 return 0; 37 }
9. 可并堆
1 #include <cstdio> 2 #include <algorithm> 3 using namespace std; 4 const int maxn = 100000 + 5; 5 int read() 6 { 7 int x = 0, f = 1; 8 char ch = getchar(); 9 while ((ch < ‘0‘) || (ch > ‘9‘)) 10 { 11 if (ch == ‘-‘) 12 f = -f; 13 ch = getchar(); 14 } 15 while ((ch >= ‘0‘) && (ch <= ‘9‘)) 16 { 17 x = x * 10 + ch - ‘0‘; 18 ch = getchar(); 19 } 20 return x * f; 21 } 22 struct node 23 { 24 node* son[2]; 25 node* fa; 26 int val, dist, pos; 27 }; 28 node tnode[maxn + 10]; 29 node *p[maxn + 10]; 30 int n, m; 31 inline int upd_dist(node* now) 32 { 33 if (now->son[1] != NULL) 34 now->dist = now->son[1]->dist + 1; 35 else 36 now->dist = 0; 37 return 0; 38 } 39 node *merge(node *a, node *b) 40 { 41 if (a == NULL) return b; 42 if (b == NULL) return a; 43 if ((a->val >= b->val) && (a->pos > b->pos)) 44 swap(a, b); 45 a->son[1] = merge(a->son[1], b); 46 a->son[1]->fa = a; 47 if ((a->son[0] != NULL) && (a->son[1] != NULL) && (a->son[0]->dist < a->son[1]->dist)) 48 swap(a->son[0], a->son[1]); 49 else if ((a->son[0] == NULL) && (a->son[1] != NULL)) 50 { 51 a->son[0] = a->son[1]; 52 a->son[1] = NULL; 53 } 54 upd_dist(a); 55 return a; 56 } 57 node* getf(node *x) 58 { 59 if (x->fa == NULL) return x; 60 return getf(x->fa); 61 } 62 int getmin_pop(node *x) 63 { 64 node *f = getf(x); 65 int v = f->val; 66 node* s = merge(f->son[0], f->son[1]); 67 if (s != NULL) s->fa = NULL; 68 f->pos = -1; 69 return v; 70 } 71 int main() 72 { 73 n = read(); m = read(); 74 for (register int i = 1; i <= n; i++) 75 { 76 p[i] = &tnode[i]; 77 p[i]->son[0] = p[i]->son[1] = p[i]->fa = NULL; 78 p[i]->val = read(); 79 p[i]->dist = 0; 80 p[i]->pos = i; 81 } 82 while (m--) 83 { 84 int op = read(), a = read(); 85 if (op == 1) 86 { 87 int b = read(); 88 if (p[a]->pos == -1 || p[b]->pos == -1) continue; 89 node *fa = getf(p[a]); 90 node *fb = getf(p[b]); 91 if (fa == fb) continue; 92 merge(fa, fb); 93 } 94 else 95 if (p[a]->pos == -1) puts("-1"); 96 else printf("%d\n", getmin_pop(p[a])); 97 } 98 return 0; 99 }
10. 快速幂
1 #include<cstdio> 2 int b,k; 3 int f(int p){ 4 if(p==0) return 1%k; 5 int tmp=f(p>>1); 6 tmp=tmp*tmp%k; 7 if(p&1) tmp=(tmp*b)%k; 8 return tmp; 9 } 10 int main(){ 11 int p; 12 scanf("%d%d%d",&b,&p,&k); 13 printf("%d",b); 14 b%=k; 15 printf("^%d mod %d=%d\n",p,k,f(p)); 16 return 0; 17 }
11. spfa最短路
1 #include<bits/stdc++.h> 2 using namespace std; 3 const int inf = 2147483647; 4 const int maxn = 10005; 5 int n, m, b, e = 0, i, j; 6 int dis[maxn], head[500005]; 7 bool vis[maxn]; 8 struct node 9 { 10 int next, to, dis; 11 }edge[500005]; 12 13 queue<int> q; 14 void addedge(int from, int to, int dis) 15 { 16 edge[++e].next = head[from]; 17 edge[e].dis = dis; 18 edge[e].to = to; 19 head[from] = e; 20 } 21 22 void spfa() 23 { 24 for (i = 1; i <= n; i++) dis[i] = inf; 25 dis[b] = 0; 26 q.push(b), vis[b] = 1; 27 while (!q.empty()) 28 { 29 int begin = q.front(); 30 q.pop(); 31 for (i = head[begin]; i; i = edge[i].next) 32 { 33 if (dis[edge[i].to] > dis[begin] + edge[i].dis) 34 { 35 dis[edge[i].to] = dis[begin] + edge[i].dis; 36 if (!vis[edge[i].to]) 37 { 38 vis[edge[i].to] = 1; 39 q.push(edge[i].to); 40 } 41 } 42 } 43 vis[begin] = 0; 44 } 45 } 46 int main() 47 { 48 cin >> n >> m >> b; 49 for (int i = 1; i <= m; i++) 50 { 51 int f, t, d; 52 cin >> f >> t >> d; 53 addedge(f, t, d); 54 } 55 spfa(); 56 for (int i = 1; i <= n; i++) 57 if (b == i) cout << 0 << ‘ ‘; 58 else cout << dis[i] << ‘ ‘; 59 return 0; 60 }
12. Floyd最短路
1 #include <cstdio> 2 int e[1005][1005], k, i, j, n, m, t1, t2, t3; 3 int main() 4 { 5 int inf = 99999999; 6 scanf("%d %d", &n, &m); 7 for (i = 1; i <= n; i++) 8 for (j = 1; j <= n; j++) 9 if (i == j) e[i][j] = 0; 10 else e[i][j] = inf; 11 for (i = 1; i <= m; i++) 12 { 13 scanf("%d %d %d", &t1, &t2, &t3); 14 e[t1][t2] = t3; 15 } 16 for (k = 1; k <= n; k++) 17 for (i = 1; i <= n; i++) 18 for (j = 1; j <= n; j++) 19 if (e[i][j] > e[i][k] + e[k][j]) 20 e[i][j] = e[i][k] + e[k][j]; 21 for (i = 1; i <= n; i++) 22 { 23 for (j = 1; j <= n; j++) 24 printf("%10d", e[i][j]); 25 } 26 printf("\n"); 27 }
13. 高精加减乘除
1 #include<bits/stdc++.h> 2 using namespace std; 3 const int M=10,P=1; 4 5 struct BigNum 6 { 7 int n[100000],l,Y; 8 BigNum(){l=1,memset(n,0,sizeof(n));} 9 //---------------------------------- 10 void init() 11 { 12 string s; 13 cin>>s; 14 int now=0,ct=0,c1=1; 15 for(int i=s.length()-1;i>=0;i--) 16 { 17 n[now]+=(s[i]-‘0‘)*c1; 18 c1*=10; 19 ct++; 20 if(ct==P&&i!=0) 21 { 22 now++; 23 c1=1; 24 ct=0; 25 } 26 } 27 l=now+1; 28 } 29 //----------------------------------- 30 void print() 31 { 32 printf("%d",n[l-1]); 33 for(int i=l-2;i>=0;i--) 34 printf("%0*d",P,n[i]); 35 printf("\n"); 36 } 37 //------------------------------------ 38 BigNum operator +(BigNum x)const 39 { 40 BigNum t=*this; 41 if(x.l>t.l)t.l=x.l; 42 for(int i=0;i<t.l;i++) 43 { 44 t.n[i]+=x.n[i]; 45 if(t.n[i]>=M) 46 { 47 t.n[i+1]+=t.n[i]/M; 48 t.n[i]%=M; 49 } 50 } 51 while(t.n[t.l]) 52 { 53 t.n[t.l+1]+=t.n[t.l]/M; 54 t.n[t.l++]%=M; 55 } 56 return t; 57 } 58 //-------------------------------------- 59 bool operator < (BigNum x) const 60 { 61 BigNum t=*this; 62 if(t.l!=x.l)return t.l<x.l; 63 for(int i=t.l-1;i>=0;i--) 64 { 65 if(t.n[i]!=x.n[i])return t.n[i]<x.n[i]; 66 } 67 return 0; 68 } 69 BigNum operator -(BigNum x)const 70 { 71 BigNum t=*this; 72 if(t<x){printf("-");swap(t,x);} 73 for(int i=0;i<t.l;i++) 74 { 75 t.n[i]-=x.n[i]; 76 if(t.n[i]<0) 77 { 78 t.n[i]+=M; 79 --t.n[i+1]; 80 } 81 } 82 while(!t.n[t.l-1]&&t.l>1)t.l--; 83 return t; 84 } 85 //-------------------------------------------- 86 BigNum operator * (BigNum x) const//提供了2种*运算 87 { 88 BigNum c,t=*this; 89 c.l=t.l+x.l-1; 90 for(int i=0;i<t.l;i++) 91 for(int j=0;j<x.l;j++) 92 { 93 c.n[i+j]+=t.n[i]*x.n[j]; 94 if(c.n[i+j]>=M) 95 { 96 c.n[i+j+1]+=c.n[i+j]/M; 97 c.n[i+j]%=M; 98 } 99 } 100 while(c.n[c.l]) 101 { 102 c.n[c.l+1]+=c.n[c.l]/M; 103 c.n[c.l++]%=M; 104 } 105 return c; 106 } 107 BigNum operator * (int x) const 108 { 109 BigNum t=*this,c; 110 c.l=t.l; 111 for(int i=0;i<t.l;i++) 112 { 113 c.n[i]+=t.n[i]*x; 114 if(c.n[i]>=M) 115 { 116 c.n[i+1]+=c.n[i]/M; 117 c.n[i]%=M; 118 } 119 } 120 while(c.n[c.l]) 121 { 122 c.n[c.l+1]+=c.n[c.l]/M; 123 c.n[c.l++]%=M; 124 } 125 return c; 126 } 127 //-------------------------------------------- 128 void Add(int x){if(x||l)n[l++]=x;} 129 void Re(){reverse(n,n+l);} 130 BigNum operator /(const BigNum &x)const//提供了2种/运算 131 { 132 BigNum t=*this,r,y; 133 y.l=0,r.l=t.l; 134 for(int i=t.l-1;i>=0;--i) 135 { 136 y.Add(t.n[i]); 137 y.Re(); 138 while(!(y<x))y=y-x,r.n[i]++; 139 while(!y.n[y.l-1] && y.l>1)--y.l; 140 y.Re(); 141 } 142 while(!r.n[r.l-1] && r.l>1)--r.l; 143 return r; 144 } 145 BigNum operator /(const int &x)const 146 { 147 BigNum t=*this,r; 148 r.l=t.l; 149 int tmp=0; 150 for(int i=t.l-1;i>=0;--i) 151 { 152 tmp+=t.n[i]; 153 if(tmp>=x) 154 r.n[i]+=tmp/x,tmp%=x; 155 tmp*=M; 156 } 157 while(!r.n[r.l-1] && r.l>1)--r.l; 158 return r; 159 } 160 //--------------------------------------- 161 162 }a,b,c; 163 164 int main() 165 { 166 a.init(); 167 b.init(); 168 /* 169 c=a+b; 170 c.print(); 171 */ 172 c=a-b; 173 c.print(); 174 /* 175 c=a*b; 176 c.print(); 177 178 c=a/b; 179 c.print(); 180 */ 181 return 0; 182 }
标签：read names fine visit dep scanf puts cin begin
原文地址：https://www.cnblogs.com/tangwuling/p/10195472.html
