Compilare: user.cpp: In function ‘int main()’: user.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size()){ ^ user.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < b.size()){ ^ user.cpp:44:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == a.size()){ ^ user.cpp:51:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i < result.size(); i++) ^ user.cpp:11:39: 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:12:41: 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); ^