Submission #605356

#	Time	Username	Problem	Language	Result	Execution time	Memory
605356		lunchbox	Feast (NOI19_feast)	C++17	30 / 100	113 ms	5708 KiB

feast

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

const int N = 300000;

int main() {
  int n, k;
  scanf("%d%d", &n, &k);
  static long long pp[N];
  for (int i = 0; i < n; i++) {
    int a;
    scanf("%d", &a);
    pp[i] = (i > 0 ? pp[i - 1] : 0) + a;
  }
  function<pair<long long, int>(long long)> solve = [&](long long t) {
    pair<long long, int> last{0, 0}, dp{0, 0};
    for (int i = 0; i < n; i++) {
      dp = max(dp, make_pair(last.first + pp[i] - t, last.second + 1));
      last = max(last, make_pair(dp.first - pp[i], dp.second));
    }
    return dp;
  };
  long long low = -1, hi = 0x3f3f3f3f3f3f3f3f;
  while (low < hi) {
    long long t = (low + hi + 1) / 2;
    if (solve(t).second >= k)
      low = t;
    else
      hi = t - 1;
  }
  printf("%lld\n", solve(low).first + low * k);
  return 0;
}

Compilation message (stderr)

feast.cpp: In function 'int main()':
feast.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |   scanf("%d%d", &n, &k);
      |   ~~~~~^~~~~~~~~~~~~~~~
feast.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     scanf("%d", &a);
      |     ~~~~~^~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11
• Subtask 6: 0 / 20
• Subtask 7: 0 / 29