Compilare: user.cpp: In function ‘int main()’: user.cpp:34:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<cuv.size(); ++j) ^ user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("litere2.in", "r", stdin); ^ user.cpp:24:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 1000000, stdin); ^