題目:如果數組M*N中某個元素為0，將其所在的行與列清零.

題目很簡單，注意很容易出現，數組所有的數據最終都是零，設置為0之前需要記錄行列.

核心代碼:

func clearZero(data:inout [[Int]])  {
        
        var rows:[Bool] = [Bool].init(repeating: false, count: data.count)
        var cols:[Bool] = [Bool].init(repeating: false, count: data[0].count)
        
        for i in 0..<rows.count {
            for j in 0..<cols.count {
                if data[i][j] == 0 {
                    rows[i] = true
                    cols[j] = true
                }
            }
        }
        
        for i in 0..<rows.count {
            for j in 0..<cols.count {
                if rows[i] || cols[j] {
                    data[i][j] = 0
                }
            }
        }
    }

測試代碼:

var clearData:[[Int]] = [[1,2,3,4,0],[5,6,7,8,9],[9,10,11,12,1],[13,14,15,16,17]]
myString.clearZero(data: &clearData)
print("FlyElephant--數組清零--\(clearData)")