Submission #157507

#	Time	Username	Problem	Language	Result	Execution time	Memory
157507		keta_tsimakuridze	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	424 ms	343672 KiB

shoes

#include<bits/stdc++.h>
using namespace std;
long long noneg,k,b[1000005],curindex,cursum,ans,n,a[1000005];
queue<long long>q[500005];
vector<long long>s;
void update(int ind,int value) {
 
	for(int i=ind; i<=n; i+=i&(-i))
		b[i]+=value;
}
 
int curs(int ind1) {
	cursum=0;
	for(int i=ind1; i>=1; i-=i&(-i))
		cursum+=b[i];
	return  cursum;
}
int count_swaps(std:: vector<int>s) {
	noneg=100005; n=s.size();
	for(k=0; k<s.size(); k++){
	a[k+1]=s[k]; }
	for(k=1;k<=n;k++)
		update(k,1);
 
	for(k=1; k<=n; k++) {
		if(q[a[k]+noneg].size()>0) {
			curindex=q[a[k]+noneg].front();
			q[a[k]+noneg].pop();
			ans+=curs(k)-curs(curindex)-1;
			if(a[k]<0) ans++;
			update(k,-1);
			update(curindex,1);
		} else q[a[k]*(-1)+noneg].push(k);
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'int count_swaps(std::vector<int>)':
shoes.cpp:20:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(k=0; k<s.size(); k++){
           ~^~~~~~~~~

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