Submission #953793

#	Time	Username	Problem	Language	Result	Execution time	Memory
953793		tnknguyen_	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	579 ms	20368 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n' 
#define pii pair<int, int>

const int MX = 3e5 + 5;
int INF;
vector<int> gr[MX];
int b[MX], p[MX];
int d[MX], vi[MX];
int n, m;

// ------------ FUNCTIONS -----------
void bfs(){
    memset(d, 63, sizeof d);
    INF = d[0];
    priority_queue<pii> q;
    q.push({0, b[1]});
    d[b[1]] = 0; 

    while(q.size()){
        int w, u;
        tie(w, u) = q.top();
        w = -w;
        q.pop();

        if(w != d[u]){
            continue;
        }

        for(int pw : gr[u]){
            for(int i = u + pw, c = 1; i < n; i += pw, ++c){
                if(d[u] + c < d[i]){
                    d[i] = d[u] + c;
                    q.push({-d[i], i});
                }
            }

            for(int i = u - pw, c = 1; i >= 0; i -= pw, ++c){
                if(d[u] + c < d[i]){
                    d[i] = d[u] + c;
                    q.push({-d[i], i});
                }
            }
        }
    }
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    //freopen("main.inp","r",stdin);
    //freopen("main.out","w",stdout);

    cin>>n>>m;

    for(int i=1; i<=m; ++i){
        cin>>b[i]>>p[i];
        gr[b[i]].push_back(p[i]);
    }

    bfs();
    cout<<(d[b[2]] == INF ? -1 : d[b[2]]);

    return 0;
}

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