Compilare: user.cpp: In function ‘int main()’: user.cpp:2:130: warning: suggest parentheses around assignment used as truth value [-Wparentheses] int x,p,s[1<<22];std::string a,b="strmatch.";int main(){std::ifstream f(b+"in");std::ofstream g(b+"out");for(f>>a>>b;p=b.find(a,p);s[x++]=++p);for(g<<x<<'\n';p<x&p<1000;g<<s[p++]<<' ');} ^ user.cpp:2:160: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] int x,p,s[1<<22];std::string a,b="strmatch.";int main(){std::ifstream f(b+"in");std::ofstream g(b+"out");for(f>>a>>b;p=b.find(a,p);s[x++]=++p);for(g<<x<<'\n';p<x&p<1000;g<<s[p++]<<' ');} ~^~