Submission #975802

#	Time	Username	Problem	Language	Result	Execution time	Memory
975802		andro	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	1 ms	1880 KiB

skyscraper

#include <bits/stdc++.h>

#define int long long

#define ll long long

using namespace std;

const int N = 30005;

vector<pair<ll,ll>>G[N];
vector<ll>dist(N,1e18),par(N,-1);

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector<pair<int,int>> a(m);
    for(int i = 0; i < m; i++) {
        cin >> a[i].first >> a[i].second;
    }
    for(int i = 0; i < m; i++) {
        for(int j = 1; j < 1000; j++) {
            if(a[i].first - j * a[i].second >= 0) {
                G[a[i].first].push_back({a[i].first - j * a[i].second, j});
            }
            if(a[i].first + j * a[i].second <= n) {
                G[a[i].first].push_back({a[i].first + j * a[i].second, j});
            }
        }
    }
    priority_queue<pair<ll,ll>,vector<pair<ll,ll>>,greater<pair<ll,ll>>>pq;
    pq.push({0,a[0].first});
    dist[0] = 0;
    vector<bool>vis(n+1,false);
    while(pq.size()) {
        ll d,u;
        tie(d,u) = pq.top();
        pq.pop();
        if(vis[u]) continue;
        vis[u] = true;
        for(auto X:G[u]) {
            if(dist[X.first] > dist[u] + X.second) {
                dist[X.first] = dist[u] + X.second;
                pq.push({dist[X.first],X.first});
                par[X.first] = u;
            }
        }
    }
    if(dist[a[1].first] == 1e18) {
        cout << - 1;
    }
    else {
        cout << dist[a[1].first];
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43