Submission #341205

#	Time	Username	Problem	Language	Result	Execution time	Memory
341205		YJU	Arranging Shoes (IOI19_shoes)	C++14	0 / 100	2 ms	640 KiB

shoes

#include<bits/stdc++.h>
//#include"shoes.h"
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=2e6+7;
const ll K=350;
const ld pi=acos(-1);
const ll INF=(1LL<<60);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

ll bit[N];

void ins(ll id,ll del){
	++id;
	for(;id;id+=(id&-id)){
		bit[id]+=del;
	}
}

ll q(ll id){
	++id;
	ll sum=0;
	for(;;id-=(id&-id)){
		sum+=bit[id];
	}
	return sum;
}

ll count_swaps(vector<int> s){
	ll ans=0,n=SZ(s),sz=0;
	map<ll,queue<ll> > m;
	REP(i,n){
		if(SZ(m[-s[i]])){
			ans-=(q(i)-q(m[-s[i]].front()));
			ans+=i-m[-s[i]].front()-1+(s[i]<0?1:0);
			ins(m[-s[i]].front(),-1);
			m[-s[i]].pop();
		}else{
			ins(i,1);
			m[s[i]].push(i);
		}
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'll count_swaps(std::vector<int>)':
shoes.cpp:44:19: warning: unused variable 'sz' [-Wunused-variable]
   44 |  ll ans=0,n=SZ(s),sz=0;
      |                   ^~

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