Submission #301222

#	Time	Username	Problem	Language	Result	Execution time	Memory
301222		eagle30	Arranging Shoes (IOI19_shoes)	C++14	30 / 100	1139 ms	814420 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
int mi(vector<int> vi, vector<int> pe, multiset<int> mu, int s){
    int n=vi.size();
    if(s==n){
        int coun=0;
        for(int i=0; i<n; i++){
            for(int j=i; j<n; j++){
                if(pe[i]==vi[j]){
                    for(int k=j-1; k>=i; k--)
                        swap(vi[k], vi[k+1]), coun++;
                    break;
                }
            }
        }
        return coun;
    }
    int mini=2e9;
    vector<int> asdf;
    for(auto x:mu){
        asdf.push_back(x);
    }
    for(int i=0; i<asdf.size(); i++){
        pe[s]=-asdf[i];
        pe[s+1]=asdf[i];
        mu.erase(mu.find(asdf[i]));
        mini=min(mini, mi(vi, pe, mu, s+2));
        mu.insert(asdf[i]);
    }
    return mini;
}
long long count_swaps(vector<int> s) {
    vector<int> yo;
    int n=s.size();
    yo.assign(n, 0);
    map<int, int> mp;
    for(int i=0; i<n; i++)
        mp[abs(s[i])]++;
    multiset<int> mu;
    for(auto x:mp){
        for(int i=0; i<x.second/2; i++)
            mu.insert(x.first);
    }
    return mi(s, yo, mu, 0);
}

Compilation message (stderr)

shoes.cpp: In function 'int mi(std::vector<int>, std::vector<int>, std::multiset<int>, int)':
shoes.cpp:24:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int i=0; i<asdf.size(); i++){
      |                  ~^~~~~~~~~~~~

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