zoukankan      html  css  js  c++  java
  • leetcode 566. Reshape the Matrix

    In MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but keep its original data.

    You're given a matrix represented by a two-dimensional array, and two positive integers r and c representing the row number and column number of the wanted reshaped matrix, respectively.

    The reshaped matrix need to be filled with all the elements of the original matrix in the same row-traversing order as they were.

    If the 'reshape' operation with given parameters is possible and legal, output the new reshaped matrix; Otherwise, output the original matrix.

    Example 1:

    Input: 
    nums = 
    [[1,2],
     [3,4]]
    r = 1, c = 4
    Output: 
    [[1,2,3,4]]
    Explanation:
    The row-traversing of nums is [1,2,3,4]. The new reshaped matrix is a 1 * 4 matrix, fill it row by row by using the previous list.

    Example 2:

    Input: 
    nums = 
    [[1,2],
     [3,4]]
    r = 2, c = 4
    Output: 
    [[1,2],
     [3,4]]
    Explanation:
    There is no way to reshape a 2 * 2 matrix to a 2 * 4 matrix. So output the original matrix.

    Note:

    1. The height and width of the given matrix is in range [1, 100].
    2. The given r and c are all positive.

    这个题目好无聊

    class Solution {
    public:
        vector<vector<int>> matrixReshape(vector<vector<int>>& nums, int r, int c) {
            vector<vector<int> > w;
            vector<int> v;
            if (nums.size() == 0 || (r * c > nums.size()*nums[0].size())) return nums;
            for (int i = 0; i < nums.size(); ++i) {
                for (int j = 0; j < nums[i].size(); ++j) {
                    v.push_back(nums[i][j]);
                    if (v.size() == c) {
                        w.push_back(v);
                        v.clear();
                    }
                }
            }
            return w;
        }
    };
  • 相关阅读:
    iOS 面试题汇总
    iOS管理文件和目录
    文件管理
    Cocoapods依赖管理
    IOS开发几何类方法 CGGeometry.h文件
    CGContext
    respondsToSelector的相关使用
    Java数组5作业(2015-8-27)
    Java错误1(2015-8-27)
    Java数组4(2015-8-27)
  • 原文地址:https://www.cnblogs.com/pk28/p/7248543.html
Copyright © 2011-2022 走看看