Compilare: main.cpp:2:46: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 2 | int x,p,s[1<<22];std::string a,b="strmatch.";main(){std::ofstream g(b+"out");for(std::ifstream(b+"in")>>a>>b;p=b.find(a,p)+1;s[x++]=p-1);for(g<<x<<'\n';p<x&p<1000;g<<s[p++]<<' ');} | ^~~~ main.cpp: In function 'int main()': main.cpp:2:111: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 2 | int x,p,s[1<<22];std::string a,b="strmatch.";main(){std::ofstream g(b+"out");for(std::ifstream(b+"in")>>a>>b;p=b.find(a,p)+1;s[x++]=p-1);for(g<<x<<'\n';p<x&p<1000;g<<s[p++]<<' ');} | ~^~~~~~~~~~~~~~ main.cpp:2:154: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] 2 | int x,p,s[1<<22];std::string a,b="strmatch.";main(){std::ofstream g(b+"out");for(std::ifstream(b+"in")>>a>>b;p=b.find(a,p)+1;s[x++]=p-1);for(g<<x<<'\n';p<x&p<1000;g<<s[p++]<<' ');} | ~^~