Submission #312790

#	Time	Username	Problem	Language	Result	Execution time	Memory
312790		Basilhijaz	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1138 ms	543092 KiB

shoes

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

using namespace std;

#define pb push_back

vector<pair<int, int> > pairs;
long long count_swaps(vector<int> s) {
    int n = s.size();
    queue<int> left[2*n + 1];
    queue<int> right[2*n + 1];
    for(int i = 0; i < n; i++){
        if(s[i] < 0){
            if(!right[abs(s[i])].empty()){
                pairs.pb({right[abs(s[i])].front(), i});
                right[abs(s[i])].pop();
            }
            else{
                left[abs(s[i])].push(i);
            }
        }
        else{
            if(!left[s[i]].empty()){
                pairs.pb({left[s[i]].front(), i});
                left[s[i]].pop();
            }
            else{
                right[s[i]].push(i);
            }
        }
    }
    int ans = 0;
    for(int i = 0; i < pairs.size(); i++){
        if(s[pairs[i].first] > 0){
            ans++;
        }
    }
    bool done[n];
    memset(done, 0, sizeof(done));
    for(int i = 0; i < pairs.size(); i++){
        done[pairs[i].second] = 1;
        for(int j = pairs[i].first + 1; j < pairs[i].second; j++){
            if(!done[j])ans++;
        }
    }
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:34:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(int i = 0; i < pairs.size(); i++){
      |                    ~~^~~~~~~~~~~~~~
shoes.cpp:41:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for(int i = 0; i < pairs.size(); i++){
      |                    ~~^~~~~~~~~~~~~~

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