Compilare: user.cpp: In function ‘int main()’: user.cpp:2:194: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] using namespace std;int x,p=-1,i;vector<int>s;string a,b,z="strmatch.";int main(){ifstream f(z+"in");ofstream g(z+"out");f>>a>>b;while((p=b.find(a,p+1))>-1)x++,s.push_back(p);g<<x<<'\n';while(i<x&i<1000)g<<s[i++]<<' ';} ^