Summa

input/code.cpp: In function 'int main()':
input/code.cpp:7:8: warning: unused variable 'cc' [-Wunused-variable]
   long cc = 0;
        ^~

#include<bits/stdc++.h>
using namespace std;

int main() {
  set<set<int> > v;
  int n; cin >> n;
  long cc = 0; 
  for(int i = 1; i <= 1000; i++) {
    for(int j = 1; j <= 1000; j++) {
      for(int k = 1; k <= 1000; k++) {
	if(i == j || i == k || j == k) continue;
	if(i+j+k == n) {
	  //cout << i << " : " << j << " : " << k << "\n";
	  set<int> a; a.insert(i); a.insert(j); a.insert(k);
	  v.insert(a);
	}
      }
    }
  }
  cout << v.size();
}

Test 1

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Test 2

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Test 27

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Test 28

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