Submission #152482

#	Time	Username	Problem	Language	Result	Execution time	Memory
152482		WLZ	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1080 ms	3292 KiB

shoes

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

long long count_swaps(vector<int> s) {
  long long ans = 0;
  int n = (int) s.size();
  for (int i = 0; i < n; i++) {
    if (i % 2 == 0) {
      if (s[i] < 0) {
        continue;
      }
      int idx;
      for (int j = i + 1; j < n; j++) {
        if (s[j] < 0) {
          idx = j;
          break;
        }
      }
      while (idx > i) {
        swap(s[idx], s[idx - 1]);
        idx--;
        ans++;
      }
    } else {
      if (s[i] == -s[i - 1]) {
        continue;
      }
      int idx;
      for (int j = i + 1; j < n; j++) {
        if (s[j] == -s[i - 1]) {
          idx = j;
          break;
        }
      }
      while (idx > i) {
        swap(s[idx], s[idx - 1]);
        idx--;
        ans++;
      }
    }
  }
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:29:11: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
       int idx;
           ^~~
shoes.cpp:13:11: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
       int idx;
           ^~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15