Submission #1278136

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278136		lmquan	Potatoes and fertilizers (LMIO19_bulves)	C++20	100 / 100	103 ms	10444 KiB

bulves

#define taskname ""
#include <bits/stdc++.h>
using namespace std;

int main() {
  if (fopen(taskname".inp", "r")) {
    freopen(taskname".inp", "r", stdin);
    freopen(taskname".out", "w", stdout);
  }
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);

  int n;
  cin >> n;
  long long x = 0;
  vector<pair<int, int>> a(n + 1);
  vector<long long> b(n + 1, 0);
  for (int i = 1; i <= n; i++) {
    cin >> a[i].first >> a[i].second;
    x += a[i].first - a[i].second;
    b[i] = b[i - 1] + a[i].first - a[i].second;
  }
  long long result = 0;
  for (int i = 1; i <= n; i++) {
    if (b[i] < 0) {
      result += -b[i];
      b[i] = 0;
    }
    if (b[i] > x) {
      result += b[i] - x;
      b[i] = x;
    }
  }
  result += x - b[n];
  b[n] = x;
  priority_queue<int> pq;
  for (int i = 1; i <= n; i++) {
    pq.push(b[i]);
    if (b[i] < pq.top()) {
      result += pq.top() - b[i];
      pq.pop();
      pq.push(b[i]);
    }
  }
  cout << result << '\n';


  return 0;
}

Compilation message (stderr)

bulves.cpp: In function 'int main()':
bulves.cpp:7:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |     freopen(taskname".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
bulves.cpp:8:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     freopen(taskname".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 24 / 24
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 10 / 10
• Subtask 5: 36 / 36