Submission #144906

#	Time	Username	Problem	Language	Result	Execution time	Memory
144906		LittleFlowers__	Arranging Shoes (IOI19_shoes)	C++14	45 / 100	204 ms	137464 KiB

shoes

#include <bits/stdc++.h>
#include "shoes.h"
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
#define fasty ios_base::sync_with_stdio(false),cin.tie(nullptr);
#define task "shoes"
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define bit(x,i) ((x>>(i-1))&1)
#define on(x,i) (x|(1ll<<(i-1)))
#define off(x,i) (x&~(1<<(i-1)))

const int N=100010;

int bit[N*2];
queue<int> s[N*2];

void upd(int i,int x){
	for(;i<N*2;i+=i&-i) bit[i]+=x;
}
int que(int i){
	int ret=0;
	for(;i;i-=i&-i) ret+=bit[i];
	return ret;
}

long long count_swaps(vector<int> v){
	long long ret=0;
	forinc(i,1,v.size()){
		int a=v[i-1];
		if(s[N-a].size()){
			int j=s[N-a].front(); s[N-a].pop();
			ret+=i-j-(a>0);
			ret-=que(i)-que(j);
		} else{
			s[N+a].push(i);
			upd(i,1);
		}
	}
	return ret;
}

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