Submission #1045823

#	Time	Username	Problem	Language	Result	Execution time	Memory
1045823		Sputnik123	Arranging Shoes (IOI19_shoes)	C++17	Compilation error	0 ms	0 KiB

shoes

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define pb push_back
#define in insert
#define pll pair<ll,ll>
#define vpl vector<pll>
#define vll vector <ll>
#define vl vector<ll>
#define F first
#define ll long long
#define S second
#define all(v) v.begin(),v.end()
#define endl "\n"
#define ull unsigned long long
#define ld long double
using namespace std;
//using namespace __gnu_pbds;
//#pragma GCC optimize("Ofast,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt,fma")
const ll sz=3e5+5;
const ll inf=1e18;
const ll mod=1e9+7;
const ll mod2=998244353;
const ll eps = 1e-12;
const ll P1=47; // for hashing 
const ll P2=41; // for hashing 
//template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//template<class T> using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
// ll idx = 1;
void solve()
{
    ll n;
    cin >> n;
    vll a(2 * n);
    for(ll i = 0; i < a.size(); i++)
        cin >> a[i];
    cout << n * (n - 1) / 2 << endl;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    long long t=1;
    // cin>>t;
    while(t--)
    {	   
        // cout << "Case " << (int) idx <<":\n";
        solve();
        ///idx++;
    }
}
/* 
Note : don`t use fast input in interactive questions
Note : Compare long double with eps = 1e-12
*/

Compilation message (stderr)

shoes.cpp: In function 'void solve()':
shoes.cpp:36:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(ll i = 0; i < a.size(); i++)
      |                   ~~^~~~~~~~~~
/usr/bin/ld: /tmp/cctA7yyq.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccCktart.o:shoes.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cctA7yyq.o: in function `main':
grader.cpp:(.text.startup+0x2a8): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status