Compilare: user.cpp: In function ‘void preKMP(char*)’: user.cpp:15:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<strlen(pattern);++i) ^ user.cpp: In function ‘void KMP(char*, char*)’: user.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<strlen(text);++i) ^ user.cpp:33:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == strlen(pattern)-1) ^ user.cpp: In function ‘int main()’: user.cpp:52:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<minim(n,a.size());++i)printf("%d ",a[i]); ^ user.cpp:6:23: note: in definition of macro ‘minim’ #define minim(a,b)((a>b)?b:a) ^ user.cpp:6:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define minim(a,b)((a>b)?b:a) ^ user.cpp:52:19: note: in expansion of macro ‘minim’ for(int i=0;i<minim(n,a.size());++i)printf("%d ",a[i]); ^ user.cpp:44:37: 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:45:39: 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); ^