Leetcode 277: Find the Celebrity (O(n^2))

leetcode_277a.cpp

#include <iostream>

using namespace std;

bool knows(int a, int b);

int findCelebrity(int n) {
    for (int b=0; b<n; ++b) {
        int count=0;
        for (int a=0; a<n; ++n) {
            if (knows(a,b)) count++;
            else break;
        }
        if (count == n) return b;
    }
    return -1;
}

//not runnable, requires leetcode knows() function