3lines: defaultdict Counter; for; sum for items if max values
```python3 []
class Solution:
    def winningPlayerCount(self, n: int, pick: List[List[int]]) -> int:
        d=defaultdict(Counter)
        for x,y in pick:d[x][y]+=1
        return sum(1 for i,c in d.items() if i<max(c.values()))
```
['Python3']