标签:cto name sync close string src with lse else
http://codeforces.com/contest/14
找最大最小的行列值即可
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define maxn 500005 7 typedef long long ll; 8 /*#ifndef ONLINE_JUDGE 9 freopen("1.txt","r",stdin); 10 #endif */ 11 12 string str[55]; 13 14 int main(){ 15 #ifndef ONLINE_JUDGE 16 freopen("1.txt","r",stdin); 17 #endif 18 std::ios::sync_with_stdio(false); 19 int n,m; 20 cin>>n>>m; 21 int hangmin=105,hangmax=-1,liemin=105,liemax=-1; 22 for(int i=0;i<n;i++) cin>>str[i]; 23 for(int i=0;i<n;i++){ 24 for(int j=0;j<m;j++){ 25 if(str[i][j]==‘*‘){ 26 hangmin=min(hangmin,i); 27 } 28 } 29 } 30 for(int i=0;i<n;i++){ 31 for(int j=0;j<m;j++){ 32 if(str[i][j]==‘*‘){ 33 hangmax=max(hangmax,i); 34 } 35 } 36 } 37 for(int i=0;i<n;i++){ 38 for(int j=0;j<m;j++){ 39 if(str[i][j]==‘*‘){ 40 liemin=min(liemin,j); 41 } 42 } 43 } 44 for(int i=0;i<n;i++){ 45 for(int j=0;j<m;j++){ 46 if(str[i][j]==‘*‘){ 47 liemax=max(liemax,j); 48 } 49 } 50 } 51 // cout<<hangmin<<" "<<hangmax<<" "<<liemin<<" "<<liemax<<endl; 52 for(int i=hangmin;i<=hangmax;i++){ 53 for(int j=liemin;j<=liemax;j++){ 54 cout<<str[i][j]; 55 } 56 cout<<endl; 57 } 58 }
水题
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define maxn 500005 7 typedef long long ll; 8 /*#ifndef ONLINE_JUDGE 9 freopen("1.txt","r",stdin); 10 #endif */ 11 12 int n,x; 13 int a[1005]; 14 15 int main(){ 16 #ifndef ONLINE_JUDGE 17 // freopen("1.txt","r",stdin); 18 #endif 19 std::ios::sync_with_stdio(false); 20 cin>>n>>x; 21 int u,v; 22 for(int i=1;i<=n;i++){ 23 cin>>u>>v; 24 if(u>v) swap(u,v); 25 a[u]++,a[v+1]--; 26 } 27 int ans=0x3f3f3f3f; 28 int num=0; 29 for(int i=0;i<=1001;i++){ 30 num+=a[i]; 31 if(num==n){ 32 ans=min(ans,abs(i-x)); 33 } 34 } 35 if(ans==0x3f3f3f3f) cout<<-1<<endl; 36 else cout<<ans<<endl; 37 }
判断四条线段是否可以构成与坐标轴平行或垂直的正方形,感觉数据有点坑
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define maxn 500005 7 typedef long long ll; 8 /*#ifndef ONLINE_JUDGE 9 freopen("1.txt","r",stdin); 10 #endif */ 11 12 map<pair<int,int>,int>mp; 13 map<pair<int,int>,int>::iterator it; 14 map< pair< pair<int,int>,pair<int,int> >,int >book; 15 16 int main(){ 17 #ifndef ONLINE_JUDGE 18 freopen("1.txt","r",stdin); 19 #endif 20 std::ios::sync_with_stdio(false); 21 int a,b,c,d; 22 int flag=0; 23 for(int i=0;i<4;i++){ 24 cin>>a>>b>>c>>d; 25 mp[make_pair(a,b)]++; 26 mp[make_pair(c,d)]++; 27 if(a==c&&b==d) flag=1; 28 vector<pair<int,int> >v; 29 v.push_back(make_pair(a,b)); 30 v.push_back(make_pair(c,d)); 31 sort(v.begin(),v.end()); 32 if(book[make_pair(v[0],v[1])]==0){ 33 book[make_pair(v[0],v[1])]=1; 34 } 35 else{ 36 flag=1; 37 } 38 // cout<<v[0].first<<" "<<v[0].second<<" "<<v[1].first<<" "<<v[1].second<<endl; 39 } 40 for(it=mp.begin();it!=mp.end();it++){ 41 if(it->second!=2){ 42 flag=1; 43 } 44 } 45 if(flag){ 46 cout<<"NO"<<endl; 47 } 48 else{ 49 vector<pair<int,int> >ve; 50 for(it=mp.begin();it!=mp.end();it++){ 51 ve.push_back(it->first); 52 } 53 sort(ve.begin(),ve.end()); 54 if(ve[0].first==ve[1].first&&ve[2].first==ve[3].first&& 55 ve[0].second==ve[2].second&&ve[1].second==ve[3].second){ 56 cout<<"YES"<<endl; 57 } 58 else cout<<"NO"<<endl; 59 } 60 } 61 62 /* 63 0 0 0 2 64 2 0 2 2 65 0 2 0 0 66 2 2 2 0 67 */
枚举删边,然后跑dfs
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define maxn 500005 7 typedef long long ll; 8 /*#ifndef ONLINE_JUDGE 9 freopen("1.txt","r",stdin); 10 #endif */ 11 12 int n; 13 vector<int>ve[205]; 14 vector<pair<int,int> >d; 15 16 int r; 17 18 int dfs(int pos,int pre){ 19 int len1=0,len2=0; 20 int tmp=0; 21 for(int i=0;i<ve[pos].size();i++){ 22 if(ve[pos][i]!=pre){ 23 tmp=max(tmp,dfs(ve[pos][i],pos)); 24 if(r>len1){len2=len1,len1=r;} 25 else{len2=max(len2,r);} 26 } 27 } 28 tmp=max(tmp,len1+len2); 29 r=len1+1; 30 return tmp; 31 } 32 33 int main(){ 34 #ifndef ONLINE_JUDGE 35 freopen("1.txt","r",stdin); 36 #endif 37 cin>>n; 38 int a,b; 39 for(int i=1;i<n;i++){ 40 cin>>a>>b; 41 ve[a].push_back(b); 42 ve[b].push_back(a); 43 d.push_back(make_pair(a,b)); 44 } 45 int ans=0; 46 for(int i=0;i<d.size();i++){ 47 int t1=dfs(d[i].first,d[i].second); 48 int t2=dfs(d[i].second,d[i].first); 49 // cout<<t1<<" "<<t2<<" "<<d[i].first<<" "<<d[i].second<<endl; 50 ans=max(ans,t1*t2); 51 } 52 cout<<ans<<endl; 53 54 55 }
DP,细节在代码里
1 #include<bits/stdc++.h> 2 using namespace std; 3 #define lson l,mid,rt<<1 4 #define rson mid+1,r,rt<<1|1 5 #define sqr(x) ((x)*(x)) 6 #define maxn 500005 7 typedef long long ll; 8 /*#ifndef ONLINE_JUDGE 9 freopen("1.txt","r",stdin); 10 #endif */ 11 12 ll dp[25][15][5][2];///分别表示第i个数,第j个尖峰数,尖峰高度和上升(1)或下降(0) 13 14 int main(){ 15 #ifndef ONLINE_JUDGE 16 // freopen("1.txt","r",stdin); 17 #endif 18 int n,m; 19 for(int i=1;i<5;i++) dp[1][1][i][1]=1; 20 for(int i=2;i<=20;i++){ 21 for(int j=1;j<=10;j++){ 22 for(int k=1;k<=4;k++){ 23 for(int l=1;l<k;l++){///更新上升的尖峰: 1:下降峰加个上升 2:上升再加一个上升 24 dp[i][j][k][1]+=dp[i-1][j-1][l][0]+dp[i-1][j][l][1]; 25 } 26 if(i==2){///2步不可能的情况 27 dp[i][j][k][0]=0; 28 } 29 else{ 30 for(int l=k+1;l<=4;l++){ 31 ///更新下降的尖峰(1:下降峰再加一个下降,2:上升峰加一个下降) 32 dp[i][j][k][0]+=dp[i-1][j][l][0]+dp[i-1][j][l][1]; 33 } 34 } 35 } 36 } 37 } 38 cin>>n>>m; 39 ll ans=0; 40 for(int i=1;i<=4;i++){ 41 ans+=dp[n][m][i][0]; 42 } 43 cout<<ans<<endl; 44 }
Codeforces Beta Round #14 (Div. 2)
标签:cto name sync close string src with lse else
原文地址:https://www.cnblogs.com/Fighting-sh/p/10353837.html