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//
// main.cpp
//
// Created by Panagiotis Chadjicostas on
// Copyright © Panagiotis Hadjicostas. All rights reserved.
//
#include <iostream>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <fstream>
#include <iomanip>
#include <iterator>
#include <limits>
#include <list>
#include <cstring>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#include <unordered_map>
using namespace std;
typedef int ll;
typedef vector<ll> vi;
typedef pair<ll,ll> ii;
#define fo(i,a,b) for(int i = a; i<=b; i++)
#define f(i,b) for(int i=0;i<b;i++)
#define F first
#define S second
#define sz size
#define ls s,m,idx<<1
#define rs m+1,e,idx<<1|1
const ll MOD=ll(1e9)+7;
const ll MAXN=2*ll(1e6);
void checker(){
ll n=rand()%20+2;
vi a(n,ll());
for(ll i=0;i<n;i++){
a[i]=rand()%20+2;
}
for(ll b=0;b<(1<<n);b++){
vi on,off;
for(ll i=0;i<n;i++){
if(i&(1<<i)){
on.push_back(i);
}
else{
off.push_back(i);
}
}
}
}
///////////////////////////////////////////////////////////////////////
struct shoes{
int s;
bool r;
};
long long count_swaps(vector <int> S) {
ll n=S.size();
shoes A[n];
ll m=n/2;
for(ll i=0;i<n;i++){
A[i].s=abs(S[i]);
A[i].r=(S[i]>0);
}
ll counter=0;
ll ans=0;
for(ll i=0;i<n;i++){
if(!A[i].r){
//cout<<i<<' '<<counter<<endl;
ans+=i-counter;
counter++;
}
}
return ans;
}
컴파일 시 표준 에러 (stderr) 메시지
shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:68:8: warning: unused variable 'm' [-Wunused-variable]
68 | ll m=n/2;
| ^
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