148856

Run ID	作者	问题	语言	测评结果	Time	Memory	代码长度	提交时间
148856	张法森	寻找第二小的数	C++	Compile Error	0 MS	0 KB	919	2026-03-01 19:31:14

Tests(0/0):

Code:

#include <iostream> #include <set> #include <vector> using namespace std; int main() { int C; cin >> C; for (int i = 0; i < C; i++){ int n; cin >> n; set<int> uniqueNumbers; for (int j = 0; j < n; j++) { int num; cin >> num; uniqueNumbers.insert(num); } if (uniqueNumbers.size() < 2) { cout << "NO" << endl; } else { auto it = uniqueNumbers.begin(); ++it; } } } return 0; }

Run Info:

Main.cc:3:19: warning: extra tokens at end of #include directive
 #include  using namespace std; 
                   ^
Main.cc: In function 'int main()':
Main.cc:6:5: error: 'cin' was not declared in this scope
     cin >> C; 
     ^
Main.cc:6:5: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/5/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
Main.cc:9:33: error: 'set' was not declared in this scope
                                 set uniqueNumbers;
                                 ^
Main.cc:9:33: note: suggested alternative:
In file included from /usr/include/c++/5/set:61:0,
                 from Main.cc:2:
/usr/include/c++/5/bits/stl_set.h:90:11: note:   'std::set'
     class set
           ^
Main.cc:9:37: error: expected primary-expression before 'int'
                                 set uniqueNumbers;
                                     ^
Main.cc:13:37: error: 'uniqueNumbers' was not declared in this scope
                                     uniqueNumbers.insert(num);
                                     ^
Main.cc:15:37: error: 'uniqueNumbers' was not declared in this scope
                                 if (uniqueNumbers.size() < 2) { 
                                     ^
Main.cc:16:37: error: 'cout' was not declared in this scope
                                     cout << "NO" << endl;
                                     ^
Main.cc:16:37: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/5/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
Main.cc:16:53: error: 'endl' was not declared in this scope
                                     cout << "NO" << endl;
                                                     ^
Main.cc:16:53: note: suggested alternative:
In file included from /usr/include/c++/5/iostream:39:0,
                 from Main.cc:1:
/usr/include/c++/5/ostream:590:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^
Main.cc: At global scope:
Main.cc:22:34: error: expected unqualified-id before 'return'
                                } return 0; }
                                  ^
Main.cc:22:44: error: expected declaration before '}' token
                                } return 0; }
                                            ^