Submission #382094

#	Time	Username	Problem	Language	Result	Execution time	Memory
382094		ritul_kr_singh	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	384 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define sp << " " <<
#define nl << "\n"

long long count_swaps(vector<int> s){
	int n = (int)s.size()/2;
	vector<vector<int>> pos0(n), pos1(n);
	for(int i=0; i<2*n; ++i){
		if(s[i]>0) pos1[s[i]-1].push_back(i);
		else pos0[-s[i]-1].push_back(i);
	}
	long long ans = 0;
	for(int i=0; i<n; ++i){
		for(int j=0; j<pos0[i].size(); ++j){
			if(pos0[i][j]>pos1[i][j]) ans += (long long)(pos0[i][j] - pos1[i][j]);
			else ans += (long long)(pos1[i][j] - pos0[i][j] - 1);
		}
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:16:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |   for(int j=0; j<pos0[i].size(); ++j){
      |                ~^~~~~~~~~~~~~~~

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