UVA 10273 Eat or not to Eat?

#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <stack>
#include <queue>
#include <cctype>
#include <cstdio>
#include <string>
#include <vector>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
#define LL long long
#define PI 3.1415926535897932626
using namespace std;
int gcd(int a, int b) {return a % b == 0 ? b : gcd(b, a % b);}
int lcm(int a, int b) {if (a < b) swap(a,b);int tmp = gcd(a,b); return a / tmp * b;}
#define MAXN 1010
int N;
int cnt[MAXN];
int src[MAXN][20];
bool killed[MAXN];
int kill(int day)
{
    int ans = 300,num = 0,st;
    for (int i = 1; i <= N; i++)
      if (!killed[i])
      {
          int val = src[i][day % cnt[i]];
          if (val == ans) num++;
          if (val < ans)
          {
              ans = val;
              st = i;
              num = 1;
          }
      }
    if (num == 1) return st;
    return 0;
}
int main()
{
    int T;
    scanf("%d",&T);
    while (T--)
    {
        scanf("%d",&N);
        for (int i = 1; i <= N; i++)
        {
            scanf("%d",&cnt[i]);
            for (int j = 1; j < cnt[i]; j++)
                scanf("%d",&src[i][j]);
            scanf("%d",&src[i][0]);
        }
        memset(killed,false,sizeof(killed));
        int tot = 0, st = 1, ed,ans = 0;
        while (true)
        {
            bool flag = false;
            int tmp = 1;
            for (int i = 1; i <= N; i++)
               if (!killed[i]) tmp = lcm(tmp,cnt[i]);
            ed = st + tmp - 1;
            for (int i = st; i <= ed; i++)
            {
                int k = kill(i);
                if (k)
                {
                    killed[k] = true;
                    //printf("%d %d\n",k,i);
                    tot ++;
                    ans = i;
                    flag = true;
                }
            }
            st = ed + 1;
            if (!flag || tot >= N) break;
        }
        printf("%d %d\n",N - tot,ans);
    }
    return 0;
}