func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b;     cin >> a >> b;     int x = abs(a - b);     if (x % 2 == 0) {       x /= 2;       cout << x * (x + 1) << endl;     } else {       x /= 2;       cout << x * (x + 1) + x + 1 << endl;     }   }   