oj.uz

Submission #605362

# Submission time Handle Problem Language Result Execution time Memory
605362 2022-07-25T16:21:57 Z lunchbox Feast (NOI19_feast) C++17
18 / 100
 123 ms 2636 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 300000;

void update(pair<long long, int>& a, const pair<long long, int>& b) {
  if (a.first < b.first)
    a = b;
}

pair<long long, int> solve(int n, long long *pp, long long t) {
  pair<long long, int> last{0, 0}, dp{0, 0};
  for (int i = 0; i < n; i++) {
    update(dp, make_pair(last.first + pp[i] - t, last.second + 1));
    update(last, make_pair(dp.first - pp[i], dp.second));
  }
  return dp;
}

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;
  }
  long long low = -1, hi = 0x3f3f3f3f3f3f3f3f;
  while (low < hi) {
    long long t = (low + hi + 1) / 2;
    if (solve(n, pp, t).second >= k)
      low = t;
    else
      hi = t - 1;
  }
  printf("%lld\n", solve(n, pp, low).first + low * k);
  return 0;
}

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:22:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |   scanf("%d%d", &n, &k);
      |   ~~~~~^~~~~~~~~~~~~~~~
feast.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     scanf("%d", &a);
      |     ~~~~~^~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 56 ms 2552 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 2452 KB Output is correct
2 Correct 43 ms 2528 KB Output is correct
3 Correct 45 ms 2516 KB Output is correct
4 Incorrect 42 ms 2516 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 87 ms 2604 KB Output is correct
2 Correct 80 ms 2572 KB Output is correct
3 Correct 112 ms 2636 KB Output is correct
4 Correct 112 ms 2480 KB Output is correct
5 Correct 86 ms 2596 KB Output is correct
6 Correct 102 ms 2616 KB Output is correct
7 Correct 86 ms 2524 KB Output is correct
8 Correct 78 ms 2592 KB Output is correct
9 Correct 112 ms 2628 KB Output is correct
10 Correct 123 ms 2612 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 264 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 264 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 264 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 56 ms 2552 KB Output isn't correct
2 Halted 0 ms 0 KB -