本文主要是介绍uva 10048(floyd变式),希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
题意:
求两个点之间经过的路径中最大噪声最小的值。
解析:
floyd的变式,每次取g[i][k] g[k][j]中的大边与当前边g[i][j]比较,取小。
代码:
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <stack>
#include <vector>
#include <queue>
#include <map>
#include <climits>
#include <cassert>
#define LL long longusing namespace std;
const int maxn = 100 + 10;
const int inf = 0x3f3f3f3f;
const double eps = 1e-8;
const double pi = 4 * atan(1.0);
const double ee = exp(1.0);int c, s, q;
int g[maxn][maxn];
void floyd()
{for (int k = 1; k <= c; k++){for (int i = 1; i <= c; i++){for (int j = 1; j <= c; j++){g[i][j] = min(g[i][j], max(g[i][k], g[k][j]));}}}
}int main()
{#ifdef LOCALfreopen("in.txt", "r", stdin);#endif // LOCALint ca = 1;while (~scanf("%d%d%d", &c, &s, &q)){if (!c && !s && !q)break;memset(g, inf, sizeof(g));for (int i = 0; i < s; i++){int u, v, w;scanf("%d%d%d", &u, &v, &w);g[u][v] = g[v][u] = w;}floyd();if (ca != 1)printf("\n");printf("Case #%d\n", ca++);for (int i = 0; i < q; i++){int u, v;scanf("%d%d", &u, &v);if (g[u][v] == inf)printf("no path\n");elseprintf("%d\n", g[u][v]);}}return 0;
}
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