Submission #991379

#	Time	Username	Problem	Language	Result	Execution time	Memory
991379		amine_aroua	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>
using namespace std;
using namespace __gnu_pbds;
template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#include <cstdio>
#include <cassert>
#define Int long long
#define fore(i , n) for(int i = 0 ; i<n;i++)
#define pb push_back
#define forn(i , x , y) for(int i = x ; i >= y; i--)
Int swaps(vector<int> a , vector<int> b)
{
    map<Int , vector<Int>> pos;
    Int m = (Int)a.size();
    fore(i , m)
    {
        pos[a[i]].pb(i);
    }
    Tree<Int> t;
    Int ans = 0;
    forn(i , m - 1 , 0)
    {
        t.insert(pos[b[i]].back());
        ans+=(Int)t.order_of_key(pos[b[i]].back());
        pos[b[i]].pop_back();
    }
    return ans;
}
Int count_swaps(vector<int> s)
{
    deque<int> cur;
    int n = (int)s.size();
    vector<int> t(n);
    for(int i = 0 ; i < n;i+=2)
    {
        cur.pb(abs(s[i]));
        if(abs(s[i + 1]) != abs(s[i]) || s[i] == s[i + 1])
            cur.pb(abs(s[i + 1]));
        t[i] = -cur.front();
        t[i + 1] = cur.front();
        cur.pop_front();
    }
    return swaps(s , t);
}
int main() {
    int n;
    assert(1 == scanf("%d", &n));
    vector<int> S(2 * n);
    for (int i = 0; i < 2 * n; i++)
        assert(1 == scanf("%d", &S[i]));
    fclose(stdin);

    long long result = count_swaps(S);

    printf("%lld\n", result);
    fclose(stdout);
    return 0;
}
/*
5
-5 -5 -4 -4 -3 5 5 4 4 3
 */

Compilation message (stderr)

/usr/bin/ld: /tmp/cciXPRWe.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccbaXLrd.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status