UVA - 567 Risk
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题意:求图上两点的最短路程,Floyd的模板题,输入的时候是按1-19对应的连接点输入的
#include <iostream>#include <cstdio>#include <cstring>#include <algorithm>using namespace std;const int MAXN = 30;int d[MAXN][MAXN],N,cas;void init(){ memset(d,0x3f3f3f3f,sizeof(d)); for (int i = 1; i <= 20; i++) d[i][i] = 0;}bool read(){ init(); int n,a; if (scanf("%d",&n) == EOF) return 0; for (int i = 0; i < n; i++){ scanf("%d",&a); d[1][a] = 1; d[a][1] = 1; } for (int i = 2; i <= 19; i++){ scanf("%d",&n); for (int j = 0; j < n; j++){ scanf("%d",&a); d[i][a] = 1; d[a][i] = 1; } } return 1;}void Floyd(){ for (int k = 1; k <= 20; k++) for (int i = 1; i <= 20; i++) for (int j = 1; j <= 20; j++) d[i][j] = min(d[i][j],d[i][k]+d[k][j]);}void solve(){ printf("Test Set #%d\n",cas++); scanf("%d",&N); int u,v; while (N--){ scanf("%d%d",&u,&v); printf("%2d to %2d: %d\n",u,v,d[u][v]); } printf("\n");}int main(){ cas = 1; while (read()){ Floyd(); solve(); }}
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