Submission #912465

#	Time	Username	Problem	Language	Result	Execution time	Memory
912465		agusss	Arranging Shoes (IOI19_shoes)	C++14	Compilation error	0 ms	0 KiB

shoes

#include "vector"
#include "stdio.h"
#include "iostream"

using namespace std;

long long count_swaps(std::vector<int> s) {
  vector<bool> used(s.size(), false);
  long long cnt = 0;
  // cout << "size:" << s.size() << "\n";
  for (int i = 0; i < (int)s.size(); i++) {
    int j;
    if (used[i]) {
      continue;
    }
    // cout << "to pair" << i << "\n";
    for (j = i + 1; j < (int)s.size(); j++) {
      if (s[j] == -s[i] and !used[j]) {
        used[j] = true;
        break;
      }
    }
    if (j < (int)s.size()) {
      // cout << i << ", " << j << "\n";
      long long distance = j - i - (s[i] < 0 ? 1 : 0);
      cnt += distance;
    }
  }
	return cnt;
}

int main() {
  int n;
  (void)scanf("%d\n", &n);
  vector<int> A(n << 1);
  for (int i = 0; i < n << 1; i++) {
    (void)scanf("%d", &A[i]);
  }
  printf("%lld\n", count_swaps(A));

  return 0;
}

Compilation message (stderr)

shoes.cpp: In function 'int main()':
shoes.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |   (void)scanf("%d\n", &n);
      |         ~~~~~^~~~~~~~~~~~
shoes.cpp:37:16: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     (void)scanf("%d", &A[i]);
      |           ~~~~~^~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccuTU10h.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccQUChgh.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status