oj.uz

Submission #465581

# Submission time Handle Problem Language Result Execution time Memory
465581 2021-08-16T12:23:18 Z lukadupli Fountain (eJOI20_fountain) C++14
100 / 100
 786 ms 18864 KB 
#include <bits/stdc++.h>

#define f first
#define s second

using namespace std;

typedef pair <int, int> pii;

const int MAXN = 1e5 + 5;

int n, q;
pii info[MAXN], child_pow2[MAXN][20];

vector <pii> available;

int main()
{
    cin >> n >> q;
    for(int i = 1; i <= n; i++) cin >> info[i].f >> info[i].s;

    for(int i = n; i >= 1; i--){
        while(!available.empty() && available.back().f <= info[i].f) available.pop_back();

        if(available.empty()) child_pow2[i][0] = {0, info[i].s};
        else child_pow2[i][0] = {available.back().s, info[i].s};

        available.push_back({info[i].f, i});
    }

    for(int j = 1; j < 20; j++){
        for(int i = 1; i <= n; i++){
            pii child = child_pow2[child_pow2[i][j - 1].f][j - 1];
            child_pow2[i][j] = {child.f, child_pow2[i][j - 1].s + child.s};
        }
    }

    while(q--){
        int ind, amount;
        cin >> ind >> amount;

        for(int i = 19; i >= 0; i--){
            if(amount > child_pow2[ind][i].s){
                amount -= child_pow2[ind][i].s;
                ind = child_pow2[ind][i].f;
            }
        }

        cout << ind << '\n';
    }

return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 4 ms 460 KB Output is correct
5 Correct 6 ms 460 KB Output is correct
6 Correct 6 ms 460 KB Output is correct
7 Correct 5 ms 460 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 506 ms 17472 KB Output is correct
2 Correct 559 ms 16228 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 4 ms 460 KB Output is correct
5 Correct 6 ms 460 KB Output is correct
6 Correct 6 ms 460 KB Output is correct
7 Correct 5 ms 460 KB Output is correct
8 Correct 506 ms 17472 KB Output is correct
9 Correct 559 ms 16228 KB Output is correct
10 Correct 8 ms 460 KB Output is correct
11 Correct 292 ms 10172 KB Output is correct
12 Correct 786 ms 18864 KB Output is correct
13 Correct 713 ms 18176 KB Output is correct
14 Correct 580 ms 17820 KB Output is correct
15 Correct 589 ms 17796 KB Output is correct