Submission #1264806

#	Time	Username	Problem	Language	Result	Execution time	Memory
1264806		hitsuuj	Arranging Shoes (IOI19_shoes)	C++20	10 / 100	21 ms	4144 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back


const int lim=1e5;
int n;
int tri[lim+10];
int seek(int x){
	int res=0;
	while(x<=n){
		res+=tri[x];
		x+=x&-x;
	}
	return res;
}
void upd(int x){
	while(x>0){
		tri[x]++;
		x-=x&-x;
	}
}
long long count_swaps(std::vector<int> s) {
	n=s.size();
	map<int,queue<int>>q;
	vector<int>tan(n);
	int cnt=1;
	for(int i=0;i<n;i++) q[s[i]].push(i);
	for(auto [x,pos]:q){
		if(x>0) break;
		while(pos.size()){
			int cur=pos.front();
			pos.pop();
			int pas=q[-s[cur]].front();
			q[-s[cur]].pop();
			tan[cur]=cnt;
			cnt++;
			tan[pas]=cnt;
			cnt++;
		}
	}
    int ans=0;
    for(int i=0;i<n;i++){

        ans+=seek(tan[i]);
        upd(tan[i]);
    }
    return ans;
}

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