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spiral traversal of matrix #402

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72 changes: 72 additions & 0 deletions Matrix/PrintSprialMatrix.cpp
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Original file line number Diff line number Diff line change
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// LC-54. Spiral Matrix
// Given an m x n matrix, return all elements of the matrix in spiral order.

/*Example 1: Input: matrix = [[1,2,3],
[4,5,6],
[7,8,9]]
Output: [1,2,3,6,9,8,7,4,5]
Example 2:
Input: matrix = [[1,2,3,4],
[5,6,7,8],
[9,10,11,12]]
Output: [1,2,3,4,8,12,11,10,9,5,6,7]*/

#include<bits\stdc++.h>
using namespace std;

vector<int> spiralOrder(vector<vector<int>>& matrix) {
int row = matrix.size();
int col = matrix[0].size();

int top = 0;
int bottom = row - 1;
int left = 0;
int right = col - 1;

int count = 0;
int total = row*col;

vector<int> ans;
while(count < total){

for(int i = left ; count<total && i<=right;i++ ){
ans.push_back(matrix[top][i]);
count++;
}
top++;

for(int i = top ;count<total && i<=bottom; i++ ){
ans.push_back(matrix[i][right]);
count++;
}
right--;

for(int i = right ;count<total && i>=left; i-- ){
ans.push_back(matrix[bottom][i]);
count++;
}
bottom--;

for(int i = bottom ;count<total && i>=top ;i-- ){
ans.push_back(matrix[i][left]);
count++;
}
left++;
}
return ans;

}



int main(){
vector<vector<int>> matrix = { {1,2,3,4},
{5,6,7,8},
{9,10,11,12}};

vector<int> result = spiralOrder(matrix);

for(auto elem : result){
cout <<elem<<" "; //1 2 3 4 8 12 11 10 9 5 6 7
}
}
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