CCF 201412-2 Z字形扫描

#include "iostream"

using namespace std;

int a[500][500];

bool rightOrDown = false; // initial go right
bool dlOrUr = false; // down left or up right, initial go down left
bool parallelOrDiagonal = false; // initial parallel;
int diagonalStep = 1;
int x = 0, y = 0;


void moveParallel() {
  if(rightOrDown) x += 1;
  else y += 1;
  cout << a[x][y] << ‘ ‘;
}

void moveDiagonal() {
  for(int s=0; s<diagonalStep; s++) {
    if(dlOrUr) x -= 1, y += 1;
    else x += 1, y -= 1;
    cout << a[x][y] << ‘ ‘;
  }
}

int main() {
  int n;
  cin >> n;
  for(int i=0; i<n; i++)
    for(int j=0; j<n; j++)
      cin >> a[i][j];
  
  cout << a[x][y] << ‘ ‘;
  for(int i=0; i<2*n-2; i++) {
    moveParallel();
    rightOrDown = !rightOrDown;
    moveDiagonal();
    dlOrUr = !dlOrUr;
    if(i<=n-2) diagonalStep++;
    else diagonalStep--;
    if(i==n-2) diagonalStep -= 2, rightOrDown = !rightOrDown;
  }
}