Submission #967095

#	Time	Username	Problem	Language	Result	Execution time	Memory
967095		Syrius	Cyberland (APIO23_cyberland)	C++17	0 / 100	33 ms	10912 KiB

cyberland

#include <bits/stdc++.h>
#include "cyberland.h"
using namespace std;
 
// #define int long long
#define ll long long
#define ff first
#define ss second
#define pint pair < ll , ll >
#define vint vector < int >
#define fast ios_base::sync_with_stdio(NULL); cin.tie(NULL)
 
const int inf = 1e9 + 9;
const int mxn = 2e5 + 2;
const int mod = 1e9 + 7;
 
vector < vector < pint > > adj(mxn);
ll dis[mxn];
bool vis[mxn] , con[mxn];

void dfs(int x , int par , int H) {
    if (vis[x]) return;
    vis[x] = 1;
    if (x == H) return;
    for (auto i : adj[x]) {
        if (i.ff == par) continue;
        dfs(i.ff , x , H);
    }
}
 
double solve(int n , int m , int k , int H , vint x , vint y , vint c , vint arr) {

    for (int i = 0; i < n; i++) {
        adj[i].clear();
        dis[i] = -2;
        con[i] = 0;
    }

    for (int i = 0; i < m; i++) {
        adj[x[i]].push_back({y[i] , c[i]});
        adj[y[i]].push_back({x[i] , c[i]});
    }

    dfs(0 , 0 , H);
    priority_queue < pint > q;
    q.push({0 , H});

    ll ans = inf * inf;
    while (!q.empty()) {
        pint p = q.top();
        q.pop();
        if (dis[p.ss] != -2) continue;
        dis[p.ss] = -p.ff;
        if (arr[p.ss] == 0 && vis[p.ss]) ans = min(ans , dis[p.ss]);
        if (p.ss == 0) {
            ans = min(ans , dis[0]);
            continue;
        }

        for (pint i : adj[p.ss]) {
            q.push({p.ff - i.ss , i.ff});
        }
    }

    if (!vis[H]) return -1;
    return ans;
}

Compilation message (stderr)

cyberland.cpp: In function 'double solve(int, int, int, int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
cyberland.cpp:48:18: warning: integer overflow in expression of type 'int' results in '-666487727' [-Woverflow]
   48 |     ll ans = inf * inf;
      |              ~~~~^~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 19
• Subtask 5: 0 / 7
• Subtask 6: 0 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3