Submission #217549

#	Time	Username	Problem	Language	Result	Execution time	Memory
217549		2fat2code	Arranging Shoes (IOI19_shoes)	C++17	45 / 100	157 ms	146552 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define all(a) (a).begin(), (a).end()
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define sz() size()
#define fr first
#define sc second
#define pi pair<int,int>
#define pii pair<pair<int,int>,int>
#define mp make_pair
//#define int long long
#define rc(s) return cout<<s,0
#define rcc(s) cout<<s,exit(0)
using namespace std;

const int mod=1e9+7;
const int modp=1999999973;
const int modulo=998244353;

long long ans,aib[200005],n;
vector<long long>arr(200005);
vector<long long>neimperecheat[200005];
queue<long long>q[200005];

void update(long long pos,long long val){
    while(pos<=n){
        aib[pos]+=val;
        pos+=(pos&-pos);
    }
}

long long sum(long long pos){
    long long rs=0;
    while(pos>=1){
        rs+=aib[pos];
        pos-=(pos&-pos);
    }
    return rs;
}

long long count_swaps(std::vector<int> s) {
    ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
    srand(chrono::steady_clock::now().time_since_epoch().count());
    n=s.size();
    long long cnt=-1;
    for(int i=0;i<s.size();i++){
        if(s[i]<0){
            cnt+=2;
            arr[i+1]=cnt;
            q[-s[i]].push(cnt+1);
        }
    }
    for(int i=0;i<s.size();i++){
        if(s[i]>0){
            arr[i+1]=q[s[i]].front();
            q[s[i]].pop();
        }
    }
    for(int i=n;i>=1;i--){
        ans+=sum(arr[i]);
        update(arr[i],1LL);
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.size();i++){
                 ~^~~~~~~~~
shoes.cpp:57:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.size();i++){
                 ~^~~~~~~~~

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