Submission #1054031

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054031		sleepntsheep	Diversity (CEOI21_diversity)	C11	Compilation error	0 ms	0 KiB

diversity

#include <cstdio>
#include <algorithm>
#define N 300001
#define A 300001

int o, n, q, a[N], fr[N], fr2[N];
long long z, y;

long long c2(int x) { return (x - 1ll) * x / 2; }

int main() {
  scanf("%d%d", &n, &q);
  for (int i = 1; i <= n; ++i) scanf("%d", a + i), ++fr[a[i]];

  for (int i = 1; i <= 300000; ++i)
    ++fr2[fr[i]];

  int sum = 0;
  for (int i = 1; i <= n; ++i)
    for (; fr2[i]--; )
      a[++o] = i, sum += i;

  for (int i = 1; i <= o; ++i) {
    int psum = 0;
    for (int j = 1; j + 1 <= o; psum += a[j++]) {
      int x = psum;
      int y = sum - psum - a[j] - a[j + 1];
      int a_ = a[j];
      int b_ = a[j + 1];
      if (-c2(b_ + y + 1) -c2(a_ + x + 1) > -c2(b_ + x + 1) - c2(a_ + y + 1))
        std::swap(a[j], a[j + 1]);
    }
  }

  int psum = 0;
  for (int i = 1; i <= o; psum += a[i++]) {
    z += c2(n + 1) - c2(psum + 1) - c2(sum - psum - a[i] + 1);
  }


  printf("%lld", z);

}

Compilation message (stderr)

diversity.c:1:10: fatal error: cstdio: No such file or directory
    1 | #include <cstdio>
      |          ^~~~~~~~
compilation terminated.