Submission #909939

#	Time	Username	Problem	Language	Result	Execution time	Memory
909939		vjudge1	Arranging Shoes (IOI19_shoes)	C++17	50 / 100	1100 ms	3248 KiB

shoes

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using pii = pair<int, int>;

int searchNumberLeftMost(vector<int> &shoes, int target) {
  for (int i = 1; i < shoes.size(); i++)
    if (shoes[i] == target)
      return i;

  return -1;
}

ll solve(vector<int> &shoes) {
  if (shoes.size() == 2)
    return shoes[0] > shoes[1];

  int shoe = shoes[0];

  int right = searchNumberLeftMost(shoes, -shoe);

  shoes.erase(shoes.begin());
  shoes.erase(shoes.begin() + right - 1);

  int distance = right;

  if (shoe < 0)
    distance--;

  return distance + solve(shoes);
}

ll count_swaps(vector<int> shoes) { return solve(shoes); }

Compilation message (stderr)

shoes.cpp: In function 'int searchNumberLeftMost(std::vector<int>&, int)':
shoes.cpp:9:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |   for (int i = 1; i < shoes.size(); i++)
      |                   ~~^~~~~~~~~~~~~~

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