Compilare: user.cpp: In function ‘void solve(std::string)’: user.cpp:30: warning: array subscript has type ‘char’ user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp:31: warning: array subscript has type ‘char’ user.cpp:44: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:69: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:70: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result