Compilare: user.cpp: In function ‘int main()’: user.cpp:52:8: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin>>p+1; ^ user.cpp:53:8: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin>>s+1; ^ user.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<match.size();++i) ^ user.cpp:48:34: 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:49:36: 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); ^ user.cpp: In function ‘void preKmp()’: user.cpp:18:25: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(k>0 && p[i]!=p[k+1]) ^