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leetcode 2133 solution

 2133Check if Every Row and Column Contains All Numbers

An n x n matrix is valid if every row and every column contains all the integers from 1 to n (inclusive).

Given an n x n integer matrix matrix, return true if the matrix is valid. Otherwise, return false.

 

Example 1:

Check if Every Row and Column Contains All Numbers

Input: matrix = [[1,2,3],[3,1,2],[2,3,1]]
Output: true
Explanation: In this case, n = 3, and every row and column contains the numbers 1, 2, and 3.
Hence, we return true.

Example 2:

Check if Every Row and Column Contains All Numbers

Input: matrix = [[1,1,1],[1,2,3],[1,2,3]]
Output: false
Explanation: In this case, n = 3, but the first row and the first column do not contain the numbers 2 or 3.
Hence, we return false.

 

Constraints:

  • n == matrix.length == matrix[i].length
  • 1 <= n <= 100
  • 1 <= matrix[i][j] <= n

solution:

class Solution {
public:
    bool checkValid(vector<vector<int>>& matrix) {
        
         unordered_set<string>s;
        for(int i = 0 ; i < matrix.size() ; i++)
        {
            for(int j = 0 ; j < matrix[i].size() ;j++)
            {
                string p = "row";
                string q = "col";
                char n = matrix[i][j]+'0';
                char l = i+'0';
                char m = j +'0';
                p = p+l+n;
                q = q + m + n;
                if(s.find(p) == s.end())
                    s.insert(p);
                else
                    return false;
                if(s.find(q) == s.end())
                    s.insert(q);
                else
                    return false;
                
                

            }
        }
        return true;
    }
};

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