Submission #533031

#	Time	Username	Problem	Language	Result	Execution time	Memory
533031		DJ035	Arranging Shoes (IOI19_shoes)	C++17	100 / 100	174 ms	156264 KiB

shoes

#include "shoes.h"
# pragma GCC optimize ("O3")
# pragma GCC optimize ("Ofast")
# pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,avx,avx2")
#include <bits/stdc++.h>
#define MEM 111111
#define sanic ios_base::sync_with_stdio(0)
#define x first
#define y second
#define pf push_front
#define pb push_back
#define all(v) v.begin(), v.end()
#define sz size()
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pi;
const ll MOD = 1e9+7;
const ll INF = 2e14+7;
ll mul(ll a, ll b){
    return ((a*b)%MOD+MOD)%MOD;
}
ll add(ll a, ll b){
    return ((a+b)%MOD+MOD)%MOD;
}
ll tr[4*MEM];
ll t,n,ans,m,k;
ll v[2*MEM];
queue<ll> q[MEM][2];
void upd(ll p, ll v){
    for(int i=p; i<2*MEM; i+=(i&-i)) tr[i] += v;
}
ll query(ll p){
    ll ret = 0;
    for(int i=p; i>0; i-=(i&-i)) ret += tr[i];
    return ret;
}
long long count_swaps(std::vector<int> s) {
	ll n=s.sz;
	ll ans=0;
	for(int i=n-1; i>=0; i--){
        if(s[i]>0) q[s[i]][0].push(i);
        else q[-s[i]][1].push(i);
	}
	for(int i=n-1; i>=0; i--){
        if(v[i]) continue;
        int j=(s[i]>0 ? q[abs(s[i])][1].front() : q[abs(s[i])][0].front());
        ll o=query(i+1)-query(j+1);
        q[abs(s[i])][0].pop();
        q[abs(s[i])][1].pop();
        if(s[i]>0) ans += i-j-1-o;
        else ans += i-j-o;
        v[j] = 1;
        v[i] = 1;
        upd(j+1, 1);
        upd(i+1, 1);
	}
	return ans;
}

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