Compilare: main.cpp:3:93: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 3 | std::ifstream e("prefix.in");std::ofstream r("prefix.out");const q b=1e7;q t,l[b];char s[b];main(){for(e>>t;t--;){e>>s+1;q _=1,g=0;for(q i=2;s[i];++i){q&m=l[i];if(s[_]^s[i])while((_=l[_-1]+1)!=1&&s[_]!=s[i]);if(s[_]==s[i])m=_++;else m=0;if(m&&i%(i-m)==0)g=i;}r<<g<<'\n';}} | ^~~~ main.cpp: In function 'int main()': main.cpp:3:119: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] 3 | std::ifstream e("prefix.in");std::ofstream r("prefix.out");const q b=1e7;q t,l[b];char s[b];main(){for(e>>t;t--;){e>>s+1;q _=1,g=0;for(q i=2;s[i];++i){q&m=l[i];if(s[_]^s[i])while((_=l[_-1]+1)!=1&&s[_]!=s[i]);if(s[_]==s[i])m=_++;else m=0;if(m&&i%(i-m)==0)g=i;}r<<g<<'\n';}} | ~^~