Submission #751347

#	Time	Username	Problem	Language	Result	Execution time	Memory
751347		kusmetliq	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1081 ms	11548 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int> a) {
    int n=a.size()/2;
    long long ans=0;
    while(a.size()>0) {
        map<int,int>m;
        for(int i=0;i<a.size();i++) {
            if(m[a[i]]==0)m[a[i]]=i+1;
        }
        int minscore=2*n;
        int scoreval=0;
        for(int i=1;i<=n+69;i++) {
            if(m[i]==0)continue;
            int updscore=0;
            updscore+=m[i]-1;
            updscore+=m[-i]-1;
            if(m[-i]<m[i])updscore--;
            if(updscore<minscore) {
                minscore=updscore;
                scoreval=i;
            }
        }
        ans+=minscore;
        a.erase(find(a.begin(),a.end(),scoreval));
        a.erase(find(a.begin(),a.end(),-scoreval));
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:9:22: 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=0;i<a.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