牛客网－Ｃ++剑指offer－第十九题(顺时针打印矩阵)

题目描述

输入一个矩阵，按照从外向里以顺时针的顺序依次打印出每一个数字，例如，如果输入如下4 X 4矩阵： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 则依次打印出数字1,2,3,4,8,12,16,15,14,13,9,5,6,7,11,10.

解题思路:按照一圈一圈的打印

参考答案:

#include <iostream>
#include <vector>
#include <string>
#include <stack>
#include <algorithm>
#include <math.h>

using namespace std;

class Solution {
public:
    vector<int> printMatrix(vector<vector<int> > matrix) {

        vector<int> my_result;
        int row = matrix.size();//行
        int col = matrix[0].size();//列

        if (row == 0 || col == 0)
            return my_result;

        int i_start = 0,i_end;
        int j_start = 0,j_end;
        i_end = col-1;
        j_end = row-1;

        while (i_start <= i_end && j_start <= j_end)
        {
            //上面那一行(从左往右打印)
            for (int i = i_start; i <= i_end; ++i) {
                my_result.push_back(matrix[j_start][i]);
            }
            
            //右侧那一列(从上往下打印)
            if (j_start < j_end)
            {
                for (int i = j_start+1; i <= j_end; ++i) {
                    my_result.push_back(matrix[i][i_end]);
                }
            }
        
            //下面那一行(从右往左打印)
            if (i_start < i_end && j_start < j_end)
            {
                for (int i = i_end-1; i >= i_start; --i) {
                    my_result.push_back(matrix[j_end][i]);
                }
            }

            //左侧那一列(从下往上打印)
            if (i_start < i_end && j_start+1 <j_end)
            {
                for (int i = j_end-1; i > j_start; --i) {
                    my_result.push_back(matrix[i][i_start]);
                }
            }

            i_end--;
            i_start++;
            j_start++;
            j_end--;
        }

        return my_result;

    }
};

int main()
{
    vector<int> my_m;
    vector<int> result;
    vector<vector<int> > my_matrix;
    int count;

    my_m.push_back(1);
    my_m.push_back(2);
    my_m.push_back(3);
    my_m.push_back(4);
    my_matrix.push_back(my_m);
    my_m.clear();

    my_m.push_back(5);
    my_m.push_back(6);
    my_m.push_back(7);
    my_m.push_back(8);
    my_matrix.push_back(my_m);
    my_m.clear();

    my_m.push_back(9);
    my_m.push_back(10);
    my_m.push_back(11);
    my_m.push_back(12);
    my_matrix.push_back(my_m);
    my_m.clear();

    my_m.push_back(13);
    my_m.push_back(14);
    my_m.push_back(15);
    my_m.push_back(16);
    my_matrix.push_back(my_m);
    my_m.clear();

    Solution solution;
    result = solution.printMatrix(my_matrix);

//    cout<<"my_matrix:"<<result[4]<<endl;
    count = 0;
    while (count < result.size())
    {
        cout<<" "<<result[count];
        count++;
    }


    return 0;
}

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