Submission #1131565

#	Time	Username	Problem	Language	Result	Execution time	Memory
1131565		12345678	Olympic Bus (JOI20_ho_t4)	C++20	11 / 100	29 ms	2120 KiB

ho_t4

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int nx=2e2+5, mx=5e4+5;

ll n, m, u[mx], v[mx], dp[nx][nx], res=1e18, c[mx], d[mx];

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n; i++) for (int j=1; j<=n; j++) if (i!=j) dp[i][j]=1e18;
    for (int i=1; i<=m; i++) cin>>u[i]>>v[i]>>c[i]>>d[i], dp[u[i]][v[i]]=min(dp[u[i]][v[i]], c[i]);
    for (int k=1; k<=n; k++) for (int i=1; i<=n; i++) for (int j=1; j<=n; j++) dp[i][j]=min(dp[i][j], dp[i][k]+dp[k][j]);
    res=min(res, dp[1][n]+dp[n][1]);
    for (int i=1; i<=m; i++) res=min(res, d[i]+min(dp[1][n], dp[1][v[i]]+dp[u[i]][n]+c[i])+min(dp[n][1], dp[n][v[i]]+dp[u[i]][1]+c[i]));
    if (res==1e18) cout<<-1;
    else cout<<res;
}

• Subtask 1: 0 / 5
• Subtask 2: 11 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 63