Submission #1108458

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108458		Tahmid690	Arranging Shoes (IOI19_shoes)	C++14	45 / 100	217 ms	149024 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;

template <typename T> using o_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <typename T, typename R> using o_map = tree<T, R, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define ll long long
#define N 200005
queue<int> Q[N];
long long count_swaps(std::vector<int> s) {
	int n=s.size()/2;
	vector<int> dst;
	for(auto u:s){
		if(u<0){
			dst.push_back(u);
			dst.push_back(-u);
		}
	}
	for(int i=0;i<dst.size();i++){
		Q[dst[i]+n].push(i+1);
	}

	vector<int> inv;
	for(auto u:s){ 
		inv.push_back(Q[u+n].front());
		Q[u+n].pop();
	}
	ll cnt=0;
	o_set<int> st;
	for(auto u:inv){
		cnt+=st.order_of_key(-u);
		st.insert(-u);
	}
	return cnt;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:23:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for(int i=0;i<dst.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