Compilare: user.cpp: In function ‘void solve()’: user.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size()-1; ++j) ^ user.cpp: In function ‘int main()’: user.cpp:92:12: warning: unused variable ‘tic’ [-Wunused-variable] time_t tic = clock(); ^ user.cpp:96:12: warning: unused variable ‘toc’ [-Wunused-variable] time_t toc = clock(); ^ user.cpp:89:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("editor.in", "rt", stdin); ^ user.cpp:90:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("editor.out", "wt", stdout); ^