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[2016-01-27][POJ][1679][The Unique MST]Description
Input
Output
Sample Input
2 3 3 1 2 1 2 3 2 3 1 3 4 4 1 2 2 2 3 2 3 4 2 4 1 2
Sample Output
3 Not Unique!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | #include <vector>#include <list>#include <map>#include <set>#include <deque>#include <queue>#include <stack>#include <bitset>#include <algorithm>#include <functional>#include <numeric>#include <utility>#include <sstream>#include <iostream>#include <iomanip>#include <cstdio>#include <cmath>#include <cstdlib>#include <cctype>#include <string>#include <cstring>#include <cstdio>#include <cmath>#include <cstdlib>#include <ctime>using namespace std;const int maxn = 110;int n,m;struct Edge{ int u,v; long long c; bool operator < (const Edge & a)const { return c < a.c; }}e[maxn*maxn/2];int fa[maxn];void ini(){ for(int i = 0;i < n + 5;i++) fa[i] = i;}int fnd(int x){ return x == fa[x] ? x : (fa[x] = fnd(fa[x]));}vector<Edge> chs;int kruskal(){ sort(e,e + m); int ct = 0; long long res = 0; ini(); chs.clear(); for(int i = 0;i < m;i++) { if(ct == n - 1) break; int u = e[i].u,v = e[i].v; u = fnd(u); v = fnd(v); if(u != v) { fa[u] = v; res += e[i].c; chs.push_back(e[i]); ct++; } } /****************************************/ for(int j = 0;j < chs.size();j++) { long long rres = 0; ini(); ct = 0; for(int i = 0;i < m;i++) { if(ct == n - 1) break; if( chs[j].v == e[i].v && chs[j].u == e[i].u && chs[j].c == e[i].c) continue; int u = e[i].u,v = e[i].v; u = fnd(u); v = fnd(v); if(u != v) { fa[u] = v; rres += e[i].c; ct++; } } if (rres == res && ct == n - 1) { res = -1; break; } } /*******************************************/ return res;}int main(){ int t; scanf("%d",&t); while(t--){ scanf("%d%d",&n,&m); int a,b,c; for(int i = 0;i < m ;i++){ scanf("%d%d%d",&a,&b,&c); e[i].u = a; e[i].v = b; e[i].c = c; } int res = kruskal(); if(res != -1) printf("%d\n",res); else puts("Not Unique!"); } return 0;} |
[2016-01-27][POJ][1679][The Unique MST]
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原文地址：http://www.cnblogs.com/qhy285571052/p/5164843.html
