Compilare: user.cpp: In function ‘void ps()’: user.cpp:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(a)) ^ user.cpp: In function ‘void kmp(int&)’: user.cpp:41:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(b)) ^ user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==strlen(a)) ^ user.cpp: In function ‘int main()’: user.cpp:64:39: 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:65:41: 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); ^