Submission #751351

#	Time	Username	Problem	Language	Result	Execution time	Memory
751351		kusmetliq	Arranging Shoes (IOI19_shoes)	C++14	85 / 100	373 ms	3132 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int> a) {
    if(a.size()<=2000) {
        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;
    } else {
        int n=a.size();
        int curcnt=0;
        long long ans=0;
        for(int i=0; i<a.size(); i++) {
            if(a[i]<0) {
                ans+=abs(i-(curcnt*2));
                curcnt++;
            }
        }
        return ans;
    }
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:10:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |             for(int i=0; i<a.size(); i++) {
      |                          ~^~~~~~~~~
shoes.cpp:35:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         for(int i=0; i<a.size(); i++) {
      |                      ~^~~~~~~~~
shoes.cpp:32:13: warning: unused variable 'n' [-Wunused-variable]
   32 |         int n=a.size();
      |             ^

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