Compilare: user.cpp: In function ‘int main()’: user.cpp:54:8: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin>>p+1; ^ user.cpp:55:8: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin>>s+1; ^ user.cpp:59:7: warning: unused variable ‘t’ [-Wunused-variable] long t=cnt; ^ user.cpp:50:34: 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:51:36: 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:20:25: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(k>0 && p[i]!=p[k+1]) ^