51nod 1459 迷宫游戏 最短路径dijkstra

题目：http://www.51nod.com/Challenge/Problem.html#!#problemId=1459

思路：使用dijkstra算法 把start作为开始节点，输出end节点即可

#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;

const int maxn = 5e2 + 5;
const int inf = 0x3f3f3f3f;
int score[maxn]; //得分和
int dis[maxn];   //花费时间和
int value[maxn]; //每个房间的分数
int vis[maxn];//标记
int map[maxn][maxn]; //图,边的权重
int n, m, start, en;

void dijkstra() {
    for (int i = 0; i < n; i++) {
        dis[i] = map[start][i];
    }
    dis[start] = 0;
    score[start] = value[start];

    for (int i = 0; i < n; i++) {
        int min = inf;
        int u = start;
        for (int j = 0; j < n; j++)
            if (!vis[j] && dis[j] < min) {
                u = j;
                min = dis[j];
            }

        vis[u] = 1;
        for (int j = 0; j < n; j++) {
            if (!vis[j] && dis[j] > dis[u] + map[u][j]) {
                dis[j] = dis[u] + map[u][j];
                score[j] =score[u] + value[j];
            } else if (dis[j] == dis[u] + map[u][j]) {
                score[j] = max(score[j], score[u] + value[j]);
            }
        }
    }
}

int main() {

    freopen("data.txt", "r", stdin);
    int x, y, z;
    memset(map, inf, sizeof(map));
    memset(score, 0, sizeof(score));
    memset(dis, inf, sizeof(dis));
    memset(vis, 0, sizeof(vis));

    cin >> n >> m >> start >> en;

    for (int i = 0; i < n; i++) {
        cin >> value[i];
    }
    for (int i = 0; i < m; i++) {
        cin >> x >> y >> z;
        map[x][y] = map[y][x] = z;
    }
    dijkstra();
    cout << dis[en] << ' ' << score[en];

    return 0;
}

思路来源 https://blog.csdn.net/f_zyj/article/details/52069848