Compilare: user.cpp: In function ‘int main()’: user.cpp:59:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == strlen(A)) { ^ user.cpp:70:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < matches.size(); ++ i) { ^ user.cpp:35:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ user.cpp:36:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^ user.cpp:40:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(A, sizeof(A), stdin); ^ user.cpp:41:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(B, sizeof(B), stdin); ^