2352. Equal Row and Column Pairs
Given a 0-indexed n x n integer matrix grid, return the number of pairs (Ri, Cj) such that row Ri and column Cj are equal.
A row and column pair is considered equal if they contain the same elements in the same order (i.e. an equal array).
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| class Solution {
public:
int equalPairs(vector<vector<int>>& A) {
unordered_map<string,int> mp;
int n = A.size(), m = A[0].size();
for(int i = 0; i < n; i++) {
string now = "";
for(int j = 0; j < m; j++) {
now += to_string(A[i][j]) + "#";
}
mp[now]++;
}
int res = 0;
for(int i = 0; i < m; i++) {
string now = "";
for(int j = 0; j < n; j++) {
now += to_string(A[j][i]) + "#";
}
res += mp[now];
}
return res;
}
};
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