Compilare: user.cpp: In function ‘void solve(std::string)’: user.cpp:29: warning: array subscript has type ‘char’ user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp:30: warning: array subscript has type ‘char’ user.cpp:41: warning: array subscript has type ‘char’ user.cpp:41: warning: array subscript has type ‘char’ user.cpp:43: warning: array subscript has type ‘char’ user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp:45: warning: array subscript has type ‘char’ user.cpp:46: warning: array subscript has type ‘char’ user.cpp:47: warning: array subscript has type ‘char’ user.cpp:48: warning: array subscript has type ‘char’ user.cpp:48: warning: array subscript has type ‘char’ user.cpp:48: warning: array subscript has type ‘char’ user.cpp:48: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:68: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:69: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result