Submission #1041374

#	Time	Username	Problem	Language	Result	Execution time	Memory
1041374		arnavsrivastava0123	Reversing a Sequence (IOI16_reverse)	C++14	Compilation error	0 ms	0 KiB

reverse

#include <bits/stdc++.h>
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define pb push_back
#define ll long long
#define ld long double
#define mp make_pair
#define F first
#define S second
 
using namespace std;

int n;

auto reverse(ll a[]){
   ll res[n];
   for(int i = n - 1, j = 0; i >= 0;i--){
      res[j++] = a[i];
   }
   return res;
}
 
void solve(){
   cin >> n;
   ll a[n];
   for(int i = 0; i < n;i++){
      cin >> a[i];
   }
   
}
 
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
 
solve();
}

Compilation message (stderr)

reverse.cpp: In function 'auto reverse(long long int*)':
reverse.cpp:20:11: warning: address of local variable 'res' returned [-Wreturn-local-addr]
   20 |    return res;
      |           ^~~
reverse.cpp:16:7: note: declared here
   16 |    ll res[n];
      |       ^~~
/usr/bin/ld: /tmp/ccwlhRm4.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc5Agd32.o:reverse.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccwlhRm4.o: in function `main':
grader.cpp:(.text.startup+0x17d): undefined reference to `reverse(std::vector<long long, std::allocator<long long> >)'
collect2: error: ld returned 1 exit status