CPP
cpp
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#include <iostream>
using namespace std;
int main()
{
int m, n;
cin >> n >> m;
int mat[1000][1000];
int value = 0;
for (int i = 0; i < n; i++) {
if (i % 2 == 0) {
for (int j = 0; j < m; j++) {
mat[i][j] = value++;
}
} else {
for (int j = m - 1; j >= 0; j--) {
mat[i][j] = value++;
}
}
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cout << mat[i][j] << " ";
}
cout << "\n";
}
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OUTPUT
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