Compilare: user.cpp: In function ‘int main()’: user.cpp:2:165: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] int x,p,s[1<<18];std::string a,b="strmatch.";int main(){std::ifstream f(b+"in");std::ofstream g(b+"out");f>>a>>b;while((p=b.find(a,p))+1)s[x++]=p;g<<x<<'\n';while(p<x&p<1000)g<<s[p++]<<' ';} ^