Submission #1062890

#	Time	Username	Problem	Language	Result	Execution time	Memory
1062890		Ahmed57	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	600 KiB

shoes

#include "bits/stdc++.h"
using namespace std;
int seg[400001];
void build(int p,int l,int r){
    if(l==r){
        seg[p] = 0;
        return ;
    }
    int md = (l+r)/2;
    build(p*2,l,md);
    build(p*2+1,md+1,r);
    seg[p] = seg[p*2]+seg[p*2+1];
}
void update(int p,int l,int r,int idx,int val){
    if(l==r){
        seg[p]+=val;
        return ;
    }
    int md = (l+r)/2;
    if(idx<=md)update(p*2,l,md,idx,val);
    else update(p*2+1,md+1,r,idx,val);
    seg[p] = seg[p*2]+seg[p*2+1];
}
int query(int p,int l,int r,int lq,int rq){
    if(l>=lq&&r<=rq)return seg[p];
    if(r<lq||l>rq)return 0;
    int md = (l+r)/2;
    return query(p*2,l,md,lq,rq)+query(p*2+1,md+1,r,lq,rq);
}
long long count_swaps(vector<int> s){
    build(1,0,s.size());
    int n = s.size();
    map<int,stack<int>> v; 
    long long ans = 0;
    for(int i = 0;i<n;i++){
        if(v[-s[i]].size()==0){
            v[s[i]].push(i);update(1,0,n,i,1);}
        else{
            ans+=(i-query(1,0,n,0,v[-s[i]].top()));
            update(1,0,n,v[-s[i]].top(),1);
            v[-s[i]].pop();
            if(s[i]<0)ans++;
        }
    }
    return ans;
}

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