Submission #1132071

#	Time	Username	Problem	Language	Result	Execution time	Memory
1132071		vladilius	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	57 / 100	146 ms	327680 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define pb push_back
#define ff first
#define ss second
const int inf = 1e9;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, m; cin>>n>>m;
    vector<int> x(m + 1), y(m + 1);
    for (int i = 1; i <= m; i++){
        cin>>x[i]>>y[i];
        x[i]++;
    }
    vector<vector<int>> ww(n + 1, vector<int>(n + 1, inf));
    for (int i = 1; i <= m; i++){
        int f = x[i] + y[i], cc = 1;
        while (f <= n){
            ww[x[i]][f] = min(ww[x[i]][f], cc);
            f += y[i]; cc++;
        }
        f = x[i] - y[i]; cc = 1;
        while (f > 0){
            ww[x[i]][f] = min(ww[x[i]][f], cc);
            f -= y[i]; cc++;
        }
    }
    
    vector<pii> g[n + 1];
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
            if (ww[i][j] != inf){
                g[i].pb({j, ww[i][j]});
            }
        }
    }

    priority_queue<pii, vector<pii>, greater<pii>> pq; pq.push({0, x[1]});
    vector<int> out(n + 1, inf); out[x[1]] = 0;
    while (!pq.empty()){
        auto [d, v] = pq.top(); pq.pop();
        for (auto [u, w]: g[v]){
            int s = d + w;
            if (s < out[u]){
                out[u] = s;
                pq.push({out[u], u});
            }
        }
    }
    
    cout<<((out[x[2]] == inf) ? -1 : out[x[2]])<<"\n";
}

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