Submission #626586

#	Time	Username	Problem	Language	Result	Execution time	Memory
626586		Trunkty	Arranging Shoes (IOI19_shoes)	C++14	45 / 100	321 ms	146532 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
//#define int ll

#include "shoes.h"

ll cnt,ans;
deque<ll> shoes[200005];
ll arr[200005];

deque<ll> countinv(deque<ll> x){
	if(x.size()==1){
		return x;
	}
	ll mid = x.size()/2LL-1LL;
	deque<ll> a,b,c;
	for(ll i=0;i<=mid;i++){
		a.push_back(x[i]);
	}
	for(ll i=mid+1;i<x.size();i++){
		b.push_back(x[i]);
	}
	a = countinv(a);
	b = countinv(b);
	while(a.size()>0){
		int i = a.back();
		while(b.size()>0 and b.back()>i){
			c.push_front(b.back());
			b.pop_back();
		}
		ans += b.size();
		c.push_front(i);
		a.pop_back();
	}
	while(b.size()>0){
		c.push_front(b.back());
		b.pop_back();
	}
	return c;
}

ll count_swaps(vector<int> s){
	for(ll i=0;i<s.size();i++){
		if(s[i]<0){
			cnt += 2;
			arr[i+1] = cnt-1;
			shoes[-s[i]].push_back(cnt);
		}
	}
	for(ll i=0;i<s.size();i++){
		if(s[i]>0){
			arr[i+1] = shoes[s[i]].front();
			shoes[s[i]].pop_front();
		}
	}
	deque<ll> dq;
	for(int i=1;i<=s.size();i++){
		dq.push_back(arr[i]);
	}
	countinv(dq);
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'std::deque<long long int> countinv(std::deque<long long int>)':
shoes.cpp:21:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::deque<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for(ll i=mid+1;i<x.size();i++){
      |                 ~^~~~~~~~~
shoes.cpp: In function 'll count_swaps(std::vector<int>)':
shoes.cpp:44:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |  for(ll i=0;i<s.size();i++){
      |             ~^~~~~~~~~
shoes.cpp:51:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |  for(ll i=0;i<s.size();i++){
      |             ~^~~~~~~~~
shoes.cpp:58:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |  for(int i=1;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