Submission #1222408

#	Time	Username	Problem	Language	Result	Execution time	Memory
1222408		Robert_junior	Fountain (eJOI20_fountain)	C++20	100 / 100	147 ms	35360 KiB

fountain

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
#define ins insert
#define pb push_back
#define F first
#define S second
const int N = 2e5+4, M = 5e5 + 7;
const int mod = 1e9 + 7;
int up[N][20], up1[N][20];
int c[N], d[N];
void solve(){
    int n, q;
    cin>>n>>q;
    for(int i = 1; i <= n; i++){
        cin>>d[i]>>c[i];
    }
    stack<int>s;
    for(int i = n; i >= 1; i--){
        while(s.size() && d[s.top()] <= d[i]){
            s.pop();
        }
        if(s.size()) up[i][0] = s.top();
        else up[i][0] = 0;
        s.push(i);
        up1[i][0] = c[up[i][0]];
    }
    for(int i = n; i >= 1; i--){
        for(int j = 1; j < 20; j++){
            up[i][j] = up[up[i][j - 1]][j - 1];
            up1[i][j] = up1[i][j - 1] + up1[up[i][j - 1]][j - 1];
        }
    }
    while(q--){
        int v, a;
        cin>>v>>a;
        a -= c[v];
        for(int i = 19; i >= 0; i--){
            if(a >= up1[v][i] && up[v][i] != 0){
                a -= up1[v][i];
                v = up[v][i];
            }
        }
        if(a >= 1) v = up[v][0];
        if(v < 1 || v > n) cout<<0<<'\n';
        else cout<<v<<'\n';
    }
}
main(){
    ios_base :: sync_with_stdio(false);
    cin.tie(nullptr); 
    int t = 1;
    //cin>>t; 
    for(int i = 1; i <= t; i++){
        //cout<<"Case "<<i<<": ";
        solve();
    }
}

Compilation message (stderr)

fountain.cpp:50:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   50 | main(){
      | ^~~~

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 40 / 40