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Submission #828546

# Submission time Handle Problem Language Result Execution time Memory
828546 2023-08-17T10:59:45 Z Gabi88 Fountain (eJOI20_fountain) C++14
100 / 100
 261 ms 21248 KB 
#include<bits/stdc++.h>
#define ll long long
using namespace std;

int dp[100005][20];
int water[100005][20];

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n, q, diam, a, b;
    cin >> n >> q;
    priority_queue<pair<int, int>> pq; // diameter, id

    for (int i = 1; i <= n; i++) {
        cin >> diam >> water[i][0];
        while(!pq.empty() && -pq.top().first < diam) {
            dp[pq.top().second][0] = i;
            pq.pop();
        }
        pq.push({-diam, i});
    }

    while(!pq.empty()) {
        dp[pq.top().second][0] = 0;
        pq.pop();
    }

    dp[0][0] = 0;
    water[0][0] = 0;

    for (int j = 1; j <= 19; j++) {
        for (int i = 0; i <= n; i++) {
            dp[i][j] = dp[dp[i][j - 1]][j - 1];
            water[i][j] = water[i][j - 1] + water[dp[i][j - 1]][j - 1];
        }
    }

    while(q--) {
        cin >> a >> b;
        for (int j = 19; j >= 0; j--) {
            if (water[a][j] >= b) {continue;}
            b -= water[a][j];
            a = dp[a][j];
        }

        cout << a << "\n";
    }
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 135 ms 18896 KB Output is correct
2 Correct 140 ms 18020 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 135 ms 18896 KB Output is correct
9 Correct 140 ms 18020 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 51 ms 11328 KB Output is correct
12 Correct 261 ms 21176 KB Output is correct
13 Correct 123 ms 20852 KB Output is correct
14 Correct 106 ms 20020 KB Output is correct
15 Correct 86 ms 21248 KB Output is correct