Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < pattern.size()) { ^ user.cpp:34:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < text.size() && j < pattern.size()) { ^ user.cpp:34:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < text.size() && j < pattern.size()) { ^ user.cpp:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == pattern.size()) { ^ user.cpp:8:39: 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:9:41: 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); ^