determine-whether-matrix-can-be-obtained-by-rotation.cpp

// Time:  O(m * n)
// Space: O(1)

class Solution {
public:
    bool findRotation(vector<vector<int>>& mat, vector<vector<int>>& target) {
        vector<function<bool (int, int)>> checks = {
            [&mat, &target](int i, int j) { return mat[i][j] == target[i][j]; },
            [&mat, &target](int i, int j) { return mat[i][j] == target[j][size(mat) - 1 - i]; },
            [&mat, &target](int i, int j) { return mat[i][j] == target[size(mat) - 1 - i][size(mat[0]) - 1 - j]; },
            [&mat, &target](int i, int j) { return mat[i][j] == target[size(mat[0]) - 1 - j][i]; },
        };
        const auto& traverse = [&mat, &target](const auto& check) {
            for (int i = 0; i < size(mat); ++i) {
                for (int j = 0; j < size(mat[0]); ++j) {
                    if (!check(i, j)) {
                        return false;
                    }
                }
            }
            return true;
        };
        for (const auto& check : checks) {
            if (traverse(check)) {
                return true;
            }
        }
        return false;
    }
};