[经典面试题][百度]在由N个正整数的集合S中,找出最大元素C,满足C=A + B - Yoona - 博客频道 - CSDN.NET


[经典面试题][百度]在由N个正整数的集合S中,找出最大元素C,满足C=A + B - Yoona - 博客频道 - CSDN.NET
在由N个正整数的集合S中,找出最大元素C,满足C=A + B 其中A,B都是集合S中元素,请给出算法描述,代码与时间复杂度分析。

【分析】

1,对集合S进行排序(快排),从小到大排序
2,让C指向集合最后一个元素(最大元素)
3,让i指向S中第一个元素,让j指向C的前一个元素
4,如果,A[i]+A[j]==C则return C;
5,如果if(A[i]+A[j]<C)则i++;
6,如果if(A[i]+A[j]>C)则j--;
7,直道i>=j依然没有找到符合条件的元素,则C在S中向前移动一位,跳至步骤3

int FindSum(int A[],int n){
    // 排序
    sort(A,A+n);
    int left,right,sum;
    // i = C
    for(int i = n - 1;i >= 2;--i){
        left = 0,right = i - 1;
        // 判断是否有A + B = i
        while(left < right){
            sum = A[left] + A[right];
            if(sum == A[i]){
                return A[i];
            }//if
            else if(sum > A[i]){
                --right;
            }
            else{
                ++left;
            }
        }//while
    }//for
    return -1;
}
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