Submission #1047433

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047433		NotLinux	Arranging Shoes (IOI19_shoes)	C++17	45 / 100	37 ms	3584 KiB

shoes

#include <bits/stdc++.h>
#include "shoes.h"
using namespace std;
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()
const long long inf = 1e18 + 7;
struct SEGT{
    vector < int > t;
    int tree_size;
    const int identity_element = 0;
    int merge(int x , int y){ 
        return x + y;
    }
    void init(int x){
        tree_size = x+3;
        t.assign(2*tree_size , identity_element);
    }
    void modify(int p, int value) {  // set value at position p
        for (t[p += tree_size] = value; p > 1; p >>= 1){
            t[p>>1] = merge(t[p] , t[p^1]); 
        }
    }
    int query(int l, int r) {  // sum on interval [l, r]
        int res = identity_element;
        for (r+=1 , l += tree_size, r += tree_size; l < r; l >>= 1, r >>= 1) {
            if (l&1) res = merge(res , t[l++]); 
            if (r&1) res = merge(res , t[--r]); 
        }
        return res;
    }
};
long long count_swaps(vector<int> s) {
	int n = sz(s) / 2;
	long long ans = 0;
	SEGT segt;
	segt.init(2 * n + 5);
	int sayac0 = 1 , sayac1 = 2;
	for(int i = 0;i<2*n;i++){
		if(s[i] < 0){
			ans += segt.query(sayac0 , 2*n);
			segt.modify(sayac0 , 1);
			sayac0+=2;				
		}
		else{
			ans += segt.query(sayac1 , 2*n);
			segt.modify(sayac1 , 1);
			sayac1+=2;
		}
	}
	return ans;
}

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