Submission #573057

#	Time	Username	Problem	Language	Result	Execution time	Memory
573057		sff_user	Arranging Shoes (IOI19_shoes)	C++17	25 / 100	1085 ms	2224 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>

#define vi vector<int>
#define ll long long

using namespace std;

ll count_swaps(vector<int> s){
	int n = s.size() / 2;
	ll ans = 0;
	int l,r;
	for(int i = 0 ; i < 2*n ; i++){
		if(s[i]<0){
			l=i;
			break;
		}
	}
	for(int i = 0 ;i < 2*n ; i++){
		if(s[i]>0){
			r=i;
			break;
		}
	}
	for(int i = 0 ; i < s.size() ; i++){
		if(s[i] < 0){
			ans += r-l-1;
			s.erase(s.begin()+r);
			for(int j = l+1 ; j < s.size() ; j++){
				if(s[j] <0){
					l=j;
					break;
				}
			}
			for(int j = r ; j < s.size() ; j++){
				if(s[j]>0){
					r=j;
					break;
				}
			}
		}
		else{
			ans += l-r;
			s.erase(s.begin() + l);
			for(int j = r+1 ; j < s.size() ; j++){
				if(s[j] >0){
					r=j;
					break;
				}
			}
			for(int j = l ; j < s.size() ; j++){
				if(s[j]<0){
					l=j;
					break;
				}
			}
		}
	}
	return ans;
}

// int main(){
// 	int p=1,n=-1;
// 	cout << count_swaps({p,n,n,n,n,p,p,n,p,p,p,n,n,p}) << endl;
// }

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |  for(int i = 0 ; i < s.size() ; i++){
      |                  ~~^~~~~~~~~~
shoes.cpp:29:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |    for(int j = l+1 ; j < s.size() ; j++){
      |                      ~~^~~~~~~~~~
shoes.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |    for(int j = r ; j < s.size() ; j++){
      |                    ~~^~~~~~~~~~
shoes.cpp:45:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |    for(int j = r+1 ; j < s.size() ; j++){
      |                      ~~^~~~~~~~~~
shoes.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |    for(int j = l ; j < s.size() ; j++){
      |                    ~~^~~~~~~~~~
shoes.cpp:27:12: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized]
   27 |    ans += r-l-1;
      |           ~^~

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