結果

問題 No.2126 MEX Game
コンテスト
ユーザー T101010101
提出日時 2022-12-20 00:53:45
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 1,933 bytes
コンパイル時間 2,449 ms
コンパイル使用メモリ 258,568 KB
最終ジャッジ日時 2025-02-09 17:16:53
ジャッジサーバーID
（参考情報） 		judge2 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 25 WA * 2
権限があれば一括ダウンロードができます
コンパイルメッセージ
In file included from /usr/include/c++/13/istream:41,
                 from /usr/include/c++/13/sstream:40,
                 from /usr/include/c++/13/complex:45,
                 from /usr/include/c++/13/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:127,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/extc++.h:32,
                 from main.cpp:3:
In member function ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>]’,
    inlined from ‘int main()’ at main.cpp:80:13:
/usr/include/c++/13/ostream:204:25: warning: ‘mex’ may be used uninitialized [-Wmaybe-uninitialized]
  204 |       { return _M_insert(__n); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function ‘int main()’:
main.cpp:53:9: note: ‘mex’ was declared here
   53 |     int mex;
      |         ^~~

ソースコード

diff # 

#pragma region Macros

#include <bits/extc++.h>
using namespace std;
using namespace __gnu_pbds;
// using namespace __gnu_cxx;

#define TO_STRING(var) # var
#define pb emplace_back
#define int ll
#define endl '\n'

using ll = long long;
using ld = long double;
const ld PI = acos(-1);
const ld EPS = 1e-10;
const int INF = 1 << 30;
const ll INFL = 1LL << 61;
// const int MOD = 998244353;
const int MOD = 1000000007;

int ceil(int x, int y) {return (x > 0 ? (x + y - 1) / y : x / y);}
int POW(int x, int y) {
    if (y != (int)(y) or y < 0 or x != 0 && x != 1 && y > 64) {cout << "Error" << endl;return 0;}
    if (y == 0) return 1;
    if (y % 2 == 0) return POW(x * x, y / 2);
    return x * POW(x, y - 1);
}

__attribute__((constructor))
void constructor() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(15);
}

#pragma endregion

signed main() {
    int N;
    cin >> N;

    vector<int> A(N);
    unordered_map<int,int> mp;
    for (int i = 0; i < N; i++) {
        cin >> A[i];
        mp[A[i]]++;
    }
    sort(A.begin(), A.end());

    if (N == 1) {cout << 0 << endl; return 0;}

    int mex;
    bool flag = false;
    for (int i = 0; i <= 1e5; i++) {
        if (mp[i] >= 3) flag = true;
        if (mp[i] == 0) {
            mex = i;
            break;
        } else if (mp[i] == 1) {
            if (i == *max_element(A.begin(),A.end()) && flag == false) {
                mex = i;
                break;
            }
            i++;
            while (i != *max_element(A.begin(),A.end()) + 1) {
                if (flag && mp[i] <= 1) {
                    mex = i;
                    break;
                } else if (mp[i] <= 2) {
                    mex = i;
                    break;
                }
                i++;
            }
            if (i == *max_element(A.begin(),A.end()) + 1) mex = i;
            break;
        }
    }
    cout << mex << endl;
}
0