Submission #1061885

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061885		Petrix	Arranging Shoes (IOI19_shoes)	C++17	0 / 100	1 ms	348 KiB

shoes

#include <iostream>
#include <vector>
#include <map>
#include <deque>
#include "shoes.h"
using namespace std;

long long count_swaps(vector<int> s){
    int n=s.size();
    map<int,deque<int>> np;
    vector<int> a;
    long long i,j,aux,rasp=0;
    for(i=0;i<n;i++){
        if(np[-s[i]].empty()){
            np[s[i]].push_back(j);
            for (j=i+1;j<=n;j+=(i+1)&(-(i+1)))
                a[j]++;
        }else{
            aux=np[-s[i]].front();np[-s[i]].pop_front();
            rasp+=i;
            for(j=aux;j;j-=aux&(-aux))
				rasp-=a[j];
            if(s[i]<0) rasp++;
            for(j=aux;j<=n;j+=aux&(-aux))
                a[j]++;
        }
    }
    return rasp;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:15:31: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   15 |             np[s[i]].push_back(j);
      |             ~~~~~~~~~~~~~~~~~~^~~

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