Submission #573209

#	Time	Username	Problem	Language	Result	Execution time	Memory
573209		AmirElarbi	Flight to the Ford (BOI22_communication)	C++17	Compilation error	0 ms	0 KiB

communication

#include <bits/stdc++.h>
#define vi vector<int>
#define ve vector
#define ll long long
#define vf vector<float>
#define vll vector<pair<ll,ll>>
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e9
#define eps 1e-7
#define eps1 1e-2
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 2e5+5
using namespace std;
const int MOD = 1e4+7;
const int nax = 1e5+5;
typedef complex<int> Point;
#define X real()
#define Y imag()
int s[nax];
vi adj[nax];
int main(){
    optimise;
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
    int n,m;
    cin >>n >> m;
    for (int i = 0; i < n; ++i)
    {
        cin >> s[i];
    }
    for (int i = 0; i < m; ++i)
    {
        int a,b;
        cin >> a >> b;
        adj[a].pb(b);
        adj[b].pb(a);
    }
    string res = "1";
    for (int i = 1; i < n; ++i)
    {
        res += '0';
    }
    cout << res << endl;
}

Compilation message (stderr)

communication.cpp: In function 'int main()':
communication.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
communication.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccdtfIvN.o: in function `main':
interface.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccB4nDVM.o:communication.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccdtfIvN.o: in function `_do_encode(int, int)':
interface.cpp:(.text+0x1d9): undefined reference to `encode(int, int)'
/usr/bin/ld: /tmp/ccdtfIvN.o: in function `_do_decode(int)':
interface.cpp:(.text+0x219): undefined reference to `decode(int)'
/usr/bin/ld: /tmp/ccdtfIvN.o: in function `main':
interface.cpp:(.text.startup+0xac): undefined reference to `decode(int)'
/usr/bin/ld: interface.cpp:(.text.startup+0x15c): undefined reference to `encode(int, int)'
collect2: error: ld returned 1 exit status