Submission #1223358

#	Time	Username	Problem	Language	Result	Execution time	Memory
1223358		khome	Fountain (eJOI20_fountain)	C++20	0 / 100	98 ms	112452 KiB

fountain

#include <bits/stdc++.h>
using namespace std;
// #define int long long

// int check(int pos, int sum) {

// }

void solve(){
    int n, q; cin >> n >> q;
    vector<pair<int, int>> vp(n+1); // diametr & capacity
    vector<pair<int, int>> gr(n+1, {0, 1e9}); // child & cost
    vector<int> pref(n+1);
    for (int i = 1; i <= n; i++) {
        cin >> vp[i].first >> vp[i].second;
        pref[i] += pref[i-1]+vp[i].second;
        // gr[i].second = vp[i].second;
        // for (int j = 1; j < i; j++){
        //     if (gr[j].first == 0 && vp[j].first < vp[i].first) {
        //         gr[j] = {i, vp[j].second};
        //     }
        // }
    }
    
    // auto check = [&](int pos, int sum) -> int {
    //     while (pos != 0){
    //         sum-=gr[pos].second;
    //         if (sum <= 0) break;
    //         pos = gr[pos].first;
    //     }
    //     return pos;
    // };

    for (int i = 0; i < q; i++){
        int ri, vi; cin >> ri >> vi;
        auto j = lower_bound(pref.begin(), pref.end(), vi+pref[ri-1]);
        int x = distance(pref.begin(), j); 
        cout << x%(n+1) << endl;

        // cout << check(ri, vi) << endl;
    }
}




signed main() {
    ios_base::sync_with_stdio(0);
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
	int t = 1; 
    // cin >> t;
    while (t--){solve();}
}

Compilation message (stderr)

fountain.cpp: In function 'int main()':
fountain.cpp:49:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
fountain.cpp:50:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40