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Submission #772743

# Submission time Handle Problem Language Result Execution time Memory
772743 2023-07-04T10:52:52 Z BlockOG Fountain (eJOI20_fountain) C++14
100 / 100
 405 ms 20576 KB 
#include <iostream>
#include <vector>
#include <utility>
#include <climits>

using namespace std;

int diameters[100000];
int down[100000][20];
int sum[100000][20];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int n, q; cin >> n >> q;

    for (int i = 0; i < n; i++) cin >> diameters[i] >> sum[i][0];

    vector<pair<int, int>> st = { { INT_MAX, -1 } };
    for (int i = n - 1; i >= 0; i--) {
        while (st.back().first <= diameters[i]) st.pop_back();
        down[i][0] = st.back().second;
        st.push_back({ diameters[i], i });
    }

    for (int j = 1; j < 20; j++) {
        for (int i = 0; i < n; i++) {
            if (down[i][j - 1] == -1) {
                down[i][j] = -1;
                sum[i][j] = sum[i][j - 1];
                continue;
            }
            down[i][j] = down[down[i][j - 1]][j - 1];
            sum[i][j] = sum[i][j - 1] + sum[down[i][j - 1]][j - 1];
        }
    }

    for (int it = 0; it < q; it++) {
        int r, v; cin >> r >> v; r--;

        for (int i = 19; i >= 0; i--) {
            if (sum[r][i] >= v) continue;
            v -= sum[r][i];
            r = down[r][i];
            if (r == -1) break;
        }

        cout << r + 1 << endl;
    }
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 3 ms 468 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 3 ms 464 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 244 ms 17568 KB Output is correct
2 Correct 267 ms 16420 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 3 ms 468 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 3 ms 464 KB Output is correct
8 Correct 244 ms 17568 KB Output is correct
9 Correct 267 ms 16420 KB Output is correct
10 Correct 3 ms 472 KB Output is correct
11 Correct 134 ms 11556 KB Output is correct
12 Correct 378 ms 20164 KB Output is correct
13 Correct 405 ms 19624 KB Output is correct
14 Correct 283 ms 19260 KB Output is correct
15 Correct 298 ms 20576 KB Output is correct