func_code_string: #include <bits/stdc++.h>   using namespace std;   struct greater {     template <class T>     bool operator()(T const &a, T const &b) const {       return a > b;     }   };   unsigned long long subV(unsigned long long a, unsigned long long b,                           unsigned long long c, unsigned long long l) {     if (a < b + c) {       return 0;     }     unsigned long long sum = (l + 2) * (l + 1) / 2;     unsigned long long df = a - b - c;     if (df >= 0) {       unsigned long long sub = (df + 2) * (df + 1) / 2;       return min(sub, sum);     }     return 0;   }   int main() {     int a, b, c, l;     scanf( %d %d %d %d , &a, &b, &c, &l);     unsigned long long total = 0;     for (unsigned long long i = 0; i <= l; i++) {       total += (i + 2) * (i + 1) / 2;     }     for (unsigned long long i = 0; i <= l; i++) {       total -= subV(a + i, b, c, l - i);       total -= subV(b + i, a, c, l - i);       total -= subV(c + i, a, b, l - i);     }     printf( %I64d , total);     return 0;   }   