Submission #1255193

#	Time	Username	Problem	Language	Result	Execution time	Memory
1255193		nerrrmin	Arranging Shoes (IOI19_shoes)	C++20	Compilation error	0 ms	0 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
#define pb push_back
using namespace std;
const long long maxn = 2e5 + 10;
long long a[maxn], n;
long long merge_sort(long long l, long long r)
{
    if(l == r)return 0;
    long long mid = (l + r)/2;
    long long onleft = merge_sort(l, mid);
    long long onright = merge_sort(mid+1, r);
    long long ans = onleft + onright;
     long long i = l, j = mid+1;
     vector < long long > w;
     while(i <= mid && j <= r)
     {
         if(a[i] < a[j])
         {
             w.pb(a[i]);
             i ++;
         }
         else
         {
             w.pb(a[j]);
             j ++;
             ans += (mid - i + 1);
         }
     }
     while(i <= mid)
     {
         w.pb(a[i]);
         i ++;
     }
     while(j <= r)
     {
         w.pb(a[j]);
         j ++;
     }
     long long p = 0;
     for (long long i = l; i <= r; ++ i)
     {
         a[i] = w[p];
         p ++;
     }
     return ans;
}
int count_swaps(std::vector<long long> s)
{

    vector < long long > lt, rt;
    long long i = 1;
    for (auto x: s)
    {
        if(x < 0)lt.pb(i);
        else rt.pb(i);
        i ++;
    }
    n = s.size();
    long long j = 0;
    long long ans = 0;
    long long pos = 1;
    for (long long i = 0; i < lt.size(); ++ i)
    {
        long long f = lt[i];
        long long s = rt[i];

       // cout << f << " " << s << endl;
        a[f] = pos;
        pos ++;
        a[s] = pos;
        pos ++;
    }

 //   for (long long i = 1; i <= n; ++ i)
//        cout << a[i] << " ";
 //   cout << endl;
    return merge_sort(1, n);
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccxg5YUm.o: in function `main':
grader.cpp:(.text.startup+0x289): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status