No.126 - LeetCode1213 - 升序三数组相同数字_找出三个增序数组中值相同的数。

class Solution {
public:
    vector<int> arraysIntersection(vector<int>& arr1, vector<int>& arr2, vector<int>& arr3) {
        int N1 = arr1.size();
        int N2 = arr2.size();
        int N3 = arr3.size();
        int a,b,c;
        a = b = c = 0;
        vector<int> ans ;
        while(a < N1 && b < N2 && c < N3){
            if(arr1[a] == arr2[b] && arr1[a] == arr3[c]){
                ans.push_back(arr1[a]);
                a++;b++;c++;
                continue;
            } 
            int A = a;
            int B = b;
            int C = c;
            bool flag1,flag2,flag3;
            flag1 = flag2 = flag3 = true;
            if(flag2 && arr1[A] > arr2[B]) b++,flag2 = false;
            if(flag3 && arr1[A] > arr3[C]) c++,flag3 = false;
            if(flag1 && arr2[B] > arr1[A]) a++,flag1 = false;
            if(flag3 && arr2[B] > arr3[C]) c++,flag3 = false;
            if(flag1 && arr3[C] > arr1[A]) a++,flag1 = false;
            if(flag2 && arr3[C] > arr2[B]) b++,flag2 = false;
        }
        return ans;
    }
};
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