Eroare de compilare: user.cpp: In function ‘int solve()’: user.cpp:36:16: error: no matching function for call to ‘std::stack<int>::push()’ e.push(); ^ user.cpp:36:16: note: candidates are: In file included from /usr/include/c++/4.8/stack:61:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:88, from user.cpp:1: /usr/include/c++/4.8/bits/stl_stack.h:186:7: note: void std::stack<_Tp, _Sequence>::push(const value_type&) [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >; std::stack<_Tp, _Sequence>::value_type = int] push(const value_type& __x) ^ /usr/include/c++/4.8/bits/stl_stack.h:186:7: note: candidate expects 1 argument, 0 provided /usr/include/c++/4.8/bits/stl_stack.h:191:7: note: void std::stack<_Tp, _Sequence>::push(std::stack<_Tp, _Sequence>::value_type&&) [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >; std::stack<_Tp, _Sequence>::value_type = int] push(value_type&& __x) ^ /usr/include/c++/4.8/bits/stl_stack.h:191:7: note: candidate expects 1 argument, 0 provided user.cpp:28:9: warning: unused variable ‘ans’ [-Wunused-variable] int ans=0; ^ user.cpp:31:9: warning: unused variable ‘sum’ [-Wunused-variable] int sum=0; ^ user.cpp:48:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:52:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in","r",stdin); ^ user.cpp:53:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out","w",stdout); ^ user.cpp:55:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^