Submission #348008

#	Time	Username	Problem	Language	Result	Execution time	Memory
348008		Chaska	Arranging Shoes (IOI19_shoes)	C++17	100 / 100	671 ms	149612 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
int n;
map<int,stack<int>> h;
bool vs[200005];
int st[1000005],lz[1000005];
void upd(int no,int i,int f,int pos)
{
    if (f<pos) return;
    if (i<pos) {
        int  l,r;
        l = no*2+1;
        r = l+1;
        lz[l] += lz[no];
        lz[r] += lz[no];
        lz[no] = 0;
        int m = (i+f)/2;
        upd(l,i,m,pos);
        upd(r,m+1,f,pos);
        return;
    } else {

        lz[no]++;
        return;
    }
}
int get(int no,int i,int f,int pos)
{
    if (f<pos || i>pos) return 0;
    if (i==f) {
        return lz[no];
    }
    int m = (i+f)/2;
    int l,r;
    l = no*2+1;
    r = l+1;
    lz[l] += lz[no];
    lz[r] += lz[no];
    lz[no] =0;
    return get(l,i,m,pos)+get(r,m+1,f,pos);
}    
long long count_swaps(vector<int> s) {
    n = s.size()/2;
    long long k=0;
    for (int i=0;i<n+n;i++) 
        h[s[i]].push(i);
    for (int i=n+n-1;i>=0;i--) if (!vs[i]) {
        h[s[i]].pop();
        int  p = h[s[i]*-1].top();
        h[s[i]*-1].pop();
        int p1,p2;
        // change the res[p] to get(0,0,n+n,p);
        p1 = p-get(0,0,n+n-1,p);
        p2 = i-get(0,0,n+n-1,i);
        k += p2 - p1;
        if (s[i]>0) k--;
        vs[p] = vs[i] = true;
        upd(0,0,n+n-1,p+1);
    }
    return k;
}

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