2133. Check 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:
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:
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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