Submission #640186

#	Time	Username	Problem	Language	Result	Execution time	Memory
640186		ymm	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	4 ms	5008 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;

static const int N = 100'010;
static vector<int> l[N], r[N];
static int frw[N];

__attribute__((optimize("O3,unroll-loops"),target("avx")))
static void add(int l, int r)
{
	Loop (i,l,r)
		frw[i] += 1;
}

long long count_swaps(std::vector<int> s) {
	ll ans = 0;
	Loop (i, 0, s.size()) {
		int x = s[i];
		if (x < 0) {
			if (r[-x].size()) {
				ans += i - r[-x].back() - frw[r[-x].back()];
				add(r[-x].back(), i);
				r[-x].pop_back();
			} else {
				l[-x].push_back(i);
			}
		} else {
			if (l[x].size()) {
				ans += i - l[x].back()  - frw[l[x].back()]- 1;
				add(l[x].back(), i);
				l[x].pop_back();
			} else {
				r[x].push_back(i);
			}
		}
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:3:40: 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]
    3 | #define Loop(x,l,r) for (ll x = (l); x < (r); ++x)
      |                                        ^
shoes.cpp:23:2: note: in expansion of macro 'Loop'
   23 |  Loop (i, 0, s.size()) {
      |  ^~~~

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