arts2algorithm二维数组矩阵的宽高变换reviewshare基于Lockwaittimeoutexceede

algorithm

二维数组矩阵的宽高变换

Reshape the Matrix

public int[][] matrixReshape(int[][] nums, int r, int c) {
    int rows = nums.length;
    int columns = 0;
    if (rows > 0) {
        columns = nums[0].length;
    }
    // illegal
    if (rows * columns != r * c) {
        return nums;
    }
    int[][] ret = new int[r][c];
    int index = 0;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < columns; j++) {
            index = i * columns + j;
            ret[index / c][index % c] = nums[i][j];
        }
    }
    return ret;
}

review

How to Fix a Lock Wait Timeout Exceeded Error in MySQL mysql获取锁超时语句执行失败的处理机制

基于Lock wait timeout exceeded; try restarting transaction问题，去查了mysql处理的办法，reviw中的blog是收获最大的，share基本是基于reviw中的blog去总结的
mysql的innodb_rollback_on_timeout