C++ 中求解和方程的非负整数解个数

#include <bits/stdc++.h>
using namespace std;
int getEquationSolutionCount(int n) {
   int count = 0;
   for (int i = 0; i <= n; i++) {
      for (int j = 0; j <= n - i; j++) {
         for (int k = 0; k <= n - i - j; k++) {
            if (i + j + k == n) {
               count++;
            }
         }
      }
   }
   return count;
}
int main() {
   int n = 10;
   cout << getEquationSolutionCount(n) << endl;
   return 0;
}