HDU5418——TSP变形——Victor and World

http://acm.hdu.edu.cn/showproblem.php?pid=5418

 

/*
模板题
先用floeyed处理


*/
/************************************************
* Author        :Powatr
* Created Time  :2015-8-22 21:20:36
* File Name     :B.cpp
 ************************************************/

#include <cstdio>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <cstring>
#include <cmath>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <list>
#include <map>
#include <set>
#include <bitset>
#include <cstdlib>
#include <ctime>
using namespace std;

#define lson l, mid, rt << 1
#define rson mid + 1, r, rt << 1 | 1
typedef long long ll;
const int MAXN = 1 << 17;
const int inf = 0x3f3f3f3f;
const int MOD = 1e9 + 7;

int d[20][20];
int dp[MAXN][20];
int main(){
    int T, n, m;
    int x, y, z;
    for(scanf("%d", &T); T--; ){
         scanf("%d%d", &n, &m);
         memset(d, inf, sizeof(d));
         memset(dp, inf, sizeof(dp));
         for(int i = 1; i <= m; i++){
             scanf("%d%d%d", &x, &y, &z);
             x--, y--;
                 if(d[x][y] > z){
                     d[x][y] = d[y][x] = z;
                 }
         }
         for(int i = 0; i < n; i++)
            d[i][i] = 0;
         for(int i = 0; i < n; i++){
             for(int j = 0; j < n; j++){
                 for(int k = 0; k < n; k++){
                     d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
                 }
             }
         }
         int maxn = (1 << n) - 1;
         dp[1][0] = 0;
         for(int i = 0; i <= maxn; i++){
             for(int j = 0; j < n; j++){
                 for(int k = 0; k < n; k++){
                     if(!((i>>k)&1))
                         dp[i|(1<<k)][k] = min(dp[i|(1<<k)][k], dp[i][j] + d[j][k]);
                     }
                 }
             }
         int ans = inf;
         for(int i = 0 ; i < n; i++){
            ans = min(ans, dp[maxn][i] + d[i][0]);
         }
         printf("%d\n", ans);
    }
    return 0;
}

　　

转载于:https://www.cnblogs.com/zero-begin/p/4751214.html