제출 #1312312

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1312312		lmaobruh	순열 (APIO22_perm)	C++20	컴파일 에러	0 ms	0 KiB

perm

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define eb emplace_back
#define pb push_back
#define fi first
#define se second
#define ii pair<int,int>
#define ve vector
#define all(x) x.begin(), x.end()
#define fo(i,a,b) for (int i=(a); i<=(b); ++i)
#define fd(i,a,b) for (int i=(a); i>=(b); --i)
#define popcount(x) __builtin_popcountll(x)
#define maxi(a, b) a = max(a, b)
#define mini(a, b) a = min(a, b)
#define siz(x) ((int)(x).size())
#define vi ve<int>
#define _ << ' ' << 

const int N = 1e6+5, inf = 1e9+10, mod = 1e9+7;
const ll lim = 1e18+5;

mt19937_64 rng((ll)(new char));

int rand(int l, int r) {
    return rng() % (r - l + 1) + l;
}

vi construct_permutation(ll k) {
    assert(k > 0);
    if (k == 1) return {};
    if (k == 2) return {0};
    if (rand(0, 2)) {
        vi res = construct_permutation(k / 2);
        res.pb(siz(res));
        if (k % 2 == 0) return res;
        res.insert(res.begin(), siz(res));
        return res;
    } else {
        int sub = rand(1, 10);
        vi res = construct_permutation(k - sub);
        fo(i,1,sub) res.insert(res.begin(), siz(res));
        return res;
    }
}

void sol() {
    
}

signed main(){
    ios::sync_with_stdio(0); cin.tie(0);
    if(fopen("A.inp","r")) {
        freopen("A.inp","r",stdin);
        freopen("A.out","w",stdout);
    }
    int tc = 1; // cin >> tc;
    fo(i,1,tc) sol();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

perm.cpp: In function 'int main()':
perm.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen("A.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~
perm.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen("A.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccOy1IJH.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc7lbi30.o:perm.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status