Compilare: user.cpp: In function ‘void preKMP(char*)’: user.cpp:13:33: 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:27:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<strlen(text);++i) ^ user.cpp:32:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == strlen(pattern)-1) ^ user.cpp: In function ‘int main()’: user.cpp:52:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();++i)cout<<a[i]<<" "; ^ user.cpp:42:37: 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:43:39: 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); ^