HDU-1301-Jungle Roads

这题kruscal跑的好快，嗯，就是一道板子题，很简单。
输入的话，输入看着很繁琐，所以就用了cin。

#include <iostream>
#include <algorithm>
using namespace std;struct Edge {int f, t, c;bool operator <(const Edge &a)const {return c < a.c;}
} edge[1000];char s, e;
int res, n, m, cost, cnt;
int pre[1000];int find(int x)
{if (x==pre[x])return x;return pre[x] = find(pre[x]);
}void unions(int a,int b)
{int x = find(a);int y = find(b);if (x!=y)pre[x] = y;
}void kruscal()
{res = 0;sort(edge, edge + cnt);for (int i = 0; i < cnt;i++) {if (find(edge[i].f)==find(edge[i].t))continue;unions(edge[i].f, edge[i].t);res += edge[i].c;}
}int main()
{ios::sync_with_stdio(false);while (cin>>n&&n) {n--;cnt = 0;for (int i = 0; i < n+1; i++)pre[i] = i;for (int i = 0; i < n; i++){cin >> s >> m;while (m--){cin >> e >> cost;edge[cnt].f = s - 'A';edge[cnt].t = e - 'A';edge[cnt].c = cost;cnt++;}}kruscal();cout << res << endl;}return 0;
}

转载于:https://www.cnblogs.com/xyqxyq/p/10397193.html

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