1030. Travel Plan (30) .cpp

#include <cstdio>
#include <algorithm>
#include <vector>
using namespace std;
int n, m, s, d;
int e[510][510], dis[510], cost[510][510];
vector<int> pre[510];
bool visit[510];
const int inf = 99999999;
vector<int> path, temppath;
int mincost = inf;
void dfs(int v) {
    temppath.push_back(v);
    if(v == s) {
        int tempcost = 0;
        for(int i = temppath.size() - 1; i > 0; i--) {
            int id = temppath[i], nextid = temppath[i-1];
            tempcost += cost[id][nextid];
        }
        if(tempcost < mincost) {
            mincost = tempcost;
            path = temppath;
        }
        temppath.pop_back();
        return ;
    }
    for(int i = 0; i < pre[v].size(); i++)
        dfs(pre[v][i]);
    temppath.pop_back();
}
int main() {
    fill(e[0], e[0] + 510 * 510, inf);
    fill(dis, dis + 510, inf);
    scanf("%d%d%d%d", &n, &m, &s, &d);
    for(int i = 0; i < m; i++) {
        int a, b;
        scanf("%d%d", &a, &b);
        scanf("%d", &e[a][b]);
        e[b][a] = e[a][b];
        scanf("%d", &cost[a][b]);
        cost[b][a] = cost[a][b];
    }
    pre[s].push_back(s);
    dis[s] = 0;
    for(int i = 0; i < n; i++) {
        int u = -1, minn = inf;
        for(int j = 0; j < n; j++) {
            if(visit[j] == false && dis[j] < minn) {
                u = j;
                minn = dis[j];
            }
        }
        if(u == -1) break;
        visit[u] = true;
        for(int v = 0; v < n; v++) {
            if(visit[v] == false && e[u][v] != inf) {
                if(dis[v] > dis[u] + e[u][v]) {
                    dis[v] = dis[u] + e[u][v];
                    pre[v].clear();
                    pre[v].push_back(u);
                } else if(dis[v] == dis[u] + e[u][v]) {
                    pre[v].push_back(u);
                }
            }
        }
    }
    dfs(d);
    for(int i = path.size() - 1; i >= 0; i--)
        printf("%d ", path[i]);
    printf("%d %d", dis[d], mincost);
    return 0;
}