Submission #1082094

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082094		logangd	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	3 ms	4956 KiB

shoes

#include "shoes.h"
using namespace std;

vector<int>p[200001];

long long count_swaps(vector<int>s){
    int n=s.size();
    for(int i=n-1;0<=i;i--)p[s[i]+n].push_back(i);
    long long r=0;
    for(int i=0;i<n;i++){
        if(p[s[i]+n].back()!=i)continue;
        p[s[i]+n].pop_back();
        if(s[i]<0)r+=p[n-s[i]].back()-i-1,p[n-s[i]].pop_back();
        else r+=p[n-s[i]].back()-i,p[n-s[i]].pop_back();
    }
	return r;
}

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