#include "shoes.h"

long long count_swaps(std::vector<int> s) {
    int n = s.size() / 2;
    return int64_t(n) * (n - 1) / 2;
}

answer.code: In function ‘long long int count_swaps(std::vector<int>)’:
answer.code:5:12: error: ‘int64_t’ was not declared in this scope
    5 |     return int64_t(n) * (n - 1) / 2;
      |            ^~~~~~~
answer.code:2:1: note: ‘int64_t’ is defined in header ‘<cstdint>’; did you forget to ‘#include <cstdint>’?
    1 | #include "shoes.h"
  +++ |+#include <cstdint>
    2 |