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Submission #811449

# Submission time Handle Problem Language Result Execution time Memory
811449 2023-08-07T04:26:02 Z taher Fountain (eJOI20_fountain) C++17
100 / 100
 122 ms 13716 KB 
#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "C:\GCC\debug.h"
#else
#define debug(...) void(42)
#endif

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, q;
  cin >> n >> q;

  vector<array<int, 2>> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i][0] >> a[i][1];
  }

  vector<vector<int>> at(n);
  vector<array<int, 2>> qe(q);
  for (int i = 0; i < q; i++) {
    cin >> qe[i][0] >> qe[i][1];
    --qe[i][0];
    at[qe[i][0]].push_back(i);
  }

  vector<int> stk;
  vector<int> pref;

  auto get = [&](int v) {
    int len = (int) pref.size();
    int low = 0, high = len - 1;

    if (pref.back() < v) {
      return 0;
    }

    while (low <= high) {
      int mid = low + (high - low) / 2;
      if (pref.back() - (mid > 0 ? pref[mid - 1] : 0) < v) {
        high = mid - 1;
      } else {
        low = mid + 1;
      }
    }
    --low;

    return stk[low] + 1;
  };

  vector<int> res(q);
  for (int i = n - 1; i >= 0; i--) {
    while (!stk.empty() && a[stk.back()][0] <= a[i][0]) {
      stk.pop_back();
      pref.pop_back();
    }

    int x = (pref.empty() ? 0 : pref.back());
    pref.push_back(x + a[i][1]);
    stk.push_back(i);

    for (auto query_id : at[i]) {
      int v = qe[query_id][1];
      res[query_id] = get(v);
    }
  }

  for (int i = 0; i < q; i++) {
    cout << res[i] << '\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 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 352 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 10476 KB Output is correct
2 Correct 68 ms 10948 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 352 KB Output is correct
8 Correct 59 ms 10476 KB Output is correct
9 Correct 68 ms 10948 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 40 ms 6800 KB Output is correct
12 Correct 94 ms 13716 KB Output is correct
13 Correct 122 ms 13412 KB Output is correct
14 Correct 72 ms 12520 KB Output is correct
15 Correct 93 ms 12896 KB Output is correct