int main() { int a, b; cin >> a >> b; int sum = 0; for (int i = a; i <= b; i++) sum += i * i; cout.precision(2); cout << fixed << (float) sum / (b - a + 1); return 0; }
Program n1; var a,b,i: integer; sum,k: real; begin sum:=0; k:=0; readln(a,b); for i:=a to b do begin sum:=sum+i*i; k:=k+1; end; writeln(sum/k:6:2); end.