Compilare: main.cpp:2:86: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] std::ifstream f("elmaj.in");std::ofstream g("elmaj.out");int n,c,k,i,j,v[1<<20];main(){f>>n;for(;i<n;i++)f>>v[i],(!k^v[i]==c)?c=v[i],k++:k--;for(k=0;j<n;j++)if(v[j]==c)k++;(k<n/2+1)?(g<<-1):(g<<c<<" "<<k);} ^ main.cpp: In function 'int main()': main.cpp:2:122: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses] std::ifstream f("elmaj.in");std::ofstream g("elmaj.out");int n,c,k,i,j,v[1<<20];main(){f>>n;for(;i<n;i++)f>>v[i],(!k^v[i]==c)?c=v[i],k++:k--;for(k=0;j<n;j++)if(v[j]==c)k++;(k<n/2+1)?(g<<-1):(g<<c<<" "<<k);} ~~~~^~~