Compilare: user.cpp: In function ‘int main()’: user.cpp:14:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pattern.size();i++){ ^ user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<pattern.size();j++) ^ user.cpp:37:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=pattern.size();j<text.size();j++) ^ user.cpp:47:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<text.size();j++) ^ user.cpp:11:36: 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:12:38: 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); ^