Function main

Hackerrank_problems/3D_Surface_Area/solution.cpp:12–48

using namespace std;

int main() {
	int H, W, ans = 0;
	cin >> H >> W;
	int A[H][W];

	for(int i = 0; i < H; i++) 
		for(int j = 0; j < W; j++)
			cin >> A[i][j];

	// Adding all the left and right surfaces
	for(int i = 0; i < H; i++) {
		ans += A[i][0];
		for(int j = 0; j < W; j++) {
			if(j == W-1)
				ans += A[i][j];
			else
				ans += abs(A[i][j] - A[i][j+1]);
		}
	}

	// Adding all the front and back surfaces
	for(int j = 0; j < W; j++) {
		ans += A[0][j];
		for(int i = 0; i < H; i++) {
			if(i == H-1)
				ans += A[i][j];
			else
				ans += abs(A[i][j] - A[i+1][j]);
		}
	}

	// Adding the top and bottom surfaces
	ans += 2 * (H * W);

	cout << ans << endl;
	return 0;
}