oj.uz

Submission #772664

# Submission time Handle Problem Language Result Execution time Memory
772664 2023-07-04T10:08:07 Z PAndaS Fountain (eJOI20_fountain) C++14
60 / 100
 1500 ms 42476 KB 
#include<iostream>
#include<vector>

#define K 20

using namespace std;

vector<vector<long>> up, sum;
vector<long> c, d;
long n, q;

long f(long u, long x){
    long res = 0;
    for(long i = 0; x; i++)if(x & (1 << i)){
        res += sum[u][i];
        u = up[u][i];
        x -= (1 << i);
        if(u == -1) break;
    }
    return res;
}

long jump(int u, int x){
    for(long i = 0; x; i++) if(x & (1 << i)){
        u = up[u][i];
        x -= (1 << i);
        if(u == -1) break;
    }
    return u;
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> q;
    c.resize(n);
    d.resize(n);
    for(long i = 0; i < n; i++) cin >> d[i] >> c[i];
    up.resize(n, vector<long>(K, -1));
    for(long i = 0; i < n; i++) for(long j = i + 1; j < n; j++){
        if(d[j] > d[i]){
            up[i][0] = j;
            break;
        }
    }
    for(long i = 1; i < K; i++) for(long j = 0; j < n; j++)if(up[j][i - 1] >= 0) up[j][i] = up[up[j][i - 1]][i - 1];
    sum.resize(n, vector<long>(K, -1));
    for(long i = 0; i < n; i++) sum[i][0] = c[i];
    for(long i = 1; i < K; i++) for(long j = 0; j < n; j++){
        sum[j][i] = sum[j][i - 1];
        if(up[j][i - 1] >= 0) sum[j][i] += sum[up[j][i - 1]][i - 1];
    }
    long res, v;
    long l, m, r;
    for(long i = 0; i < q; i++){
        cin >> res >> v;
        res--;
        l = 0;
        r = n - 1;
        while(l < r){
            m = (l + r) / 2;
            if(f(res, m) < v) l = m + 1;
            else r = m;
        }
        cout << jump(res, l - 1) + 1 << '\n';
    }
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 2 ms 724 KB Output is correct
6 Correct 2 ms 708 KB Output is correct
7 Correct 1 ms 724 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 548 ms 39968 KB Output is correct
2 Correct 635 ms 37104 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 596 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 2 ms 724 KB Output is correct
6 Correct 2 ms 708 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 548 ms 39968 KB Output is correct
9 Correct 635 ms 37104 KB Output is correct
10 Correct 2 ms 724 KB Output is correct
11 Correct 275 ms 23668 KB Output is correct
12 Correct 833 ms 42468 KB Output is correct
13 Correct 763 ms 42388 KB Output is correct
14 Correct 268 ms 42476 KB Output is correct
15 Execution timed out 1591 ms 41192 KB Time limit exceeded
16 Halted 0 ms 0 KB -