如何计算二维数组中的重复数？(C++)

#include <iostream>
#include <unordered_map>
using namespace std;

void countDuplicates(int array[][3], int rows, int cols) {
    unordered_map<int, int> countMap;

    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            int element = array[i][j];
            if (countMap.find(element) != countMap.end()) {
                countMap[element]++;
            } else {
                countMap[element] = 1;
            }
        }
    }

    for (auto it = countMap.begin(); it != countMap.end(); ++it) {
        if (it->second > 1) {
            cout << "Element " << it->first << " appears " << it->second << " times." << endl;
        }
    }
}

int main() {
    int array[][3] = {{1, 2, 3}, {4, 5, 6}, {1, 2, 3}};
    int rows = sizeof(array) / sizeof(array[0]);
    int cols = sizeof(array[0]) / sizeof(int);

    countDuplicates(array, rows, cols);

    return 0;
}