Submission #977645

#	Time	Username	Problem	Language	Result	Execution time	Memory
977645		nnin	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	264 ms	262144 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
using ll = long long;
#define pli pair<ll, int>

int N, M, B[30005], P[30005];
vector<pii> adj[30005];
ll mindis[30005];

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin>>N>>M;
    for(int i=0;i<M;i++) {
        cin>>B[i]>>P[i];
        for(int j=1;B[i]-(j*P[i])>=0;j++) {
            adj[B[i]].push_back({B[i]-(j*P[i]), j});
        }
        for(int j=1;B[i]+(j*P[i])<N;j++) {
            adj[B[i]].push_back({B[i]+(j*P[i]), j});
        }
    }
    for(int i=0;i<N;i++) mindis[i] = 1e18;
    priority_queue<pli, vector<pli>, greater<pli>> pq;
    pq.push({0ll, B[0]});
    mindis[B[0]] = 0ll;
    while(!pq.empty()) {
        auto [dis, u] = pq.top();
        pq.pop();
        if(u==B[1]) break;
        if(mindis[u]!=dis) continue;
        for(auto [v, w]:adj[u]) {
            if(mindis[v]>dis+w) {
                mindis[v] = dis+w;
                pq.push({mindis[v], v});
            }
        }
    }
    if(mindis[B[1]]==1e18) cout<<-1;
    else cout<<mindis[B[1]];
}

/*
5 3
0 2
1 1
4 1
*/

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