LeetCode之Score After Flipping Matrix（Kotlin）

问题：
We have a two dimensional matrix A where each value is 0 or 1.
A move consists of choosing any row or column, and toggling each value in that row or column: changing all 0s to 1s, and all 1s to 0s.
After making any number of moves, every row of this matrix is interpreted as a binary number, and the score of the matrix is the sum of these numbers.
Return the highest possible score.

---

方法：
使最终结果最大一共需要做两部操作：
1）遍历所有行的第一个元素，如果为0则反转该行，保证每个二进制数的最高位都为1
2）遍历所有列（不包含首列，因为首列为最高位），如果该列0的个数多于一半则反转该列
经过如上两部操作之后则矩阵的结果即为最大

具体实现：

import kotlin.math.abs

class ScoreAfterFlippingMatrix {
    fun matrixScore(A: Array): Int {
        for (i in A.indices) {
            if (A[i][0] == 0) {
                for (j in A[0].indices) {
                    A[i][j] = abs(A[i][j] - 1)
                }
            }
        }
        for (j in 1..A[0].lastIndex) {
            var zeroNum = 0
            for (i in A.indices) {
                if (A[i][j] == 0) {
                    zeroNum++
                }
            }
            if (zeroNum * 2 > A.size) {
                for (i in A.indices) {
                    A[i][j] = abs(A[i][j] - 1)
                }
            }
        }
        var sum = 0
        for (i in A.indices) {
            for (j in A[0].indices) {
                sum += A[i][j] shl (A[0].lastIndex - j)
            }
        }
        return sum
    }
}

fun main(args: Array) {
    val array = arrayOf(intArrayOf(0, 0, 1, 1), intArrayOf(1,0 ,1, 0), intArrayOf(1, 1, 0, 0))
//    val array = arrayOf(intArrayOf(0, 1), intArrayOf(1,1))
    val scoreAfterFlippingMatrix = ScoreAfterFlippingMatrix()
    val result = scoreAfterFlippingMatrix.matrixScore(array)
    print("result: $result")
}

有问题随时沟通

具体代码实现可以参考Github