Submission #695149

#	Time	Username	Problem	Language	Result	Execution time	Memory
695149		HossamHero7	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	1 ms	212 KiB

skyscraper

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
#define endl '\n'
void solve(){
    int n,m;
    cin>>n>>m;
    vector<vector<int>> adj(n+1);
    vector<pair<int,int>> v(m);
    int pos = 0;
    for(int i=0;i<m;i++){
        int a,b;cin>>a>>b;
        v[i].first = a;
        v[i].second = b;
        if(i == 1) pos = a;
        adj[a].push_back(i);
    }
    priority_queue<array<int,3>,vector<array<int,3>>,greater<array<int,3>>> q;
    q.push({0,v[0].first,0});
    vector<vector<int>> dis(n,vector<int>(m,1e9));
    while(q.size()){
        array<int,3> cur = q.top();     q.pop();
        if(dis[cur[1]][cur[2]] < cur[0]) continue;
        for(auto ch : adj[cur[1]]){
            int p = v[ch].second;
            if(cur[1]+p<n && dis[cur[1]+p][ch] > cur[0]+1){
                q.push({cur[0]+1,cur[1]+p,ch});
                dis[cur[1]+p][ch] = cur[0]+1;
            }
            if(cur[1]-p>=0 && dis[cur[1]-p][ch] > cur[0]+1){
                q.push({cur[0]+1,cur[1]-p,ch});
                dis[cur[1]-p][ch] = cur[0]+1;
            }
        }

        int p = v[cur[2]].second;
        if(cur[1]+p<n && dis[cur[1]+p][cur[2]] > cur[0]+1){
            q.push({cur[0]+1,cur[1]+p,cur[2]});
            dis[cur[1]+p][cur[2]] = cur[0]+1;
        }
        if(cur[1]-p>=0 && dis[cur[1]-p][cur[2]] > cur[0]+1){
            q.push({cur[0]+1,cur[1]-p,cur[2]});
            dis[cur[1]-p][cur[2]] = cur[0]+1;
        }
    }
    int ans = dis[v[1].first][0];
    for(int i=2;i<m;i++) ans = min(ans,dis[v[1].first][i]);
    cout<<(ans>=1e9?-1:ans)<<endl;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:11:9: warning: variable 'pos' set but not used [-Wunused-but-set-variable]
   11 |     int pos = 0;
      |         ^~~

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