#include <iostream>#include <cstdio>#include <cstring>#include <cmath>#include <algorithm>#include <cstdlib>#include <string>const int MAXN = 25 + 10;const double ESP = 10e-8;const double Pi = atan(1.0) * 4;const int INF = 0xffffff;const int MOD = 10000007;using namespace std;struct People{ int s; string n;};People a[MAXN];string str[MAXN];int main(){ int t; scanf("%d",&t); int n; while(t--){ scanf("%d",&n); for(int i = 0;i < n;i++){ cin >> a[i].n >> a[i].s; } int cnt = 0; for(int i = 0;i < n;i++){ for(int j = 0;j < n;j++){ if(i == j) continue; for(int k = 0;k < n;k++){ if(k == i || k == j) continue; if(a[i].s == a[j].s + a[k].s){ str[cnt++] = a[i].n; k = n; j = n; break; } for(int l = 0;l < n;l++){ if(l == k || l == i || l == j){ continue; } if(a[i].s == a[j].s+a[k].s+a[l].s){ str[cnt++] = a[i].n; k = n; j = n; l = n; break; } } } } } cout << cnt << endl; sort(str,str+cnt); for(int i = 0;i < cnt;i++){ cout << str[i] << endl; } } return 0;}
