Problem p00207 (C++)

Buggy submission (status: Runtime Error):
#include <iostream>
#include <queue>
#include <vector>
using namespace std;

int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};

class cordinate {

public:
  int x;
  int y;
};

int main() {
  while (1) {

    int w;
    int h;
    cin >> w >> h;
    if (w == 0 && h == 0) {
      break;
    }
    int xs;
    int ys;
    cin >> xs >> ys;
    int xg;
    int yg;
    cin >> xg >> yg;
    int n;
    cin >> n;

    vector<vector<int>> vobj;

    for (int i = 0; i < h; i++) {
      vector<int> lineobj;
      for (int j = 0; j < w; j++) {

        lineobj.push_back(0);
      }
      vobj.push_back(lineobj);
    }
    for (int i = 0; i < n; i++) {
      int c, d, x, y;
      cin >> c >> d >> x >> y;
      x--;
      y--;

      if (d == 0) {
        vobj[x][y] = c;
        vobj[x + 1][y] = c;
        vobj[x + 2][y] = c;
        vobj[x + 3][y] = c;
        vobj[x][y + 1] = c;
        vobj[x + 1][y + 1] = c;
        vobj[x + 2][y + 1] = c;
        vobj[x + 3][y + 1] = c;
      } else if (d == 1) {
        vobj[x][y] = c;
        vobj[x][y + 1] = c;
        vobj[x][y + 2] = c;
        vobj[x][y + 3] = c;
        vobj[x + 1][y] = c;
        vobj[x + 1][y + 1] = c;
        vobj[x + 1][y + 2] = c;
        vobj[x + 1][y + 3] = c;
      }
    }

    int startColor;
    startColor = vobj[xs - 1][ys - 1];
    queue<cordinate> que;

    cordinate obj;
    obj.x = xs - 1;
    obj.y = ys - 1;
    que.push(obj);
    bool flag = false;
    while (1) {
      if (startColor == 0) {
        break;
      }
      cordinate buf;
      buf = que.front();
      que.pop();

      int bx;
      int by;
      bx = buf.x;
      by = buf.y;
      if (bx == xg - 1 && by == yg - 1) {
        flag = true;
        break;
      }
      for (int i = 0; i < 4; i++) {
        if (bx + dx[i] >= 0 && bx + dx[i] <= h - 1) {
          if (by + dy[i] >= 0 && by + dy[i] <= w - 1) {
            if (vobj[bx + dx[i]][by + dy[i]] == startColor) {
              cordinate newObject;
              newObject.x = bx + dx[i];
              newObject.y = by + dy[i];
              que.push(newObject);
            }
          }
        }
      }
      vobj[bx][by] = -1;

      if (que.size() == 0) {
        break;
      }
    }

    if (flag == true) {
      cout << "OK" << endl;
    } else {
      cout << "NG" << endl;
    }
    /*for(int i = 0; i < w - 1; i++)
    {
            for(int j = 0; j < h - 1; j++)
            {
                    cout << vobj[i][j] << " ";
            }
            cout << endl;
    }  */
  }
}

Fixed submission:
#include <iostream>
#include <queue>
#include <vector>
using namespace std;

int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};

class cordinate {

public:
  int x;
  int y;
};

int main() {
  while (1) {

    int w;
    int h;
    cin >> w >> h;
    if (w == 0 && h == 0) {
      break;
    }
    w = 110;
    h = 110;

    int xs;
    int ys;
    cin >> xs >> ys;
    int xg;
    int yg;
    cin >> xg >> yg;
    int n;
    cin >> n;

    vector<vector<int>> vobj;

    for (int i = 0; i < h; i++) {
      vector<int> lineobj;
      for (int j = 0; j < w; j++) {

        lineobj.push_back(0);
      }
      vobj.push_back(lineobj);
    }
    for (int i = 0; i < n; i++) {
      int c, d, x, y;
      cin >> c >> d >> x >> y;
      x--;
      y--;

      if (d == 0) {
        vobj[x][y] = c;
        vobj[x + 1][y] = c;
        vobj[x + 2][y] = c;
        vobj[x + 3][y] = c;
        vobj[x][y + 1] = c;
        vobj[x + 1][y + 1] = c;
        vobj[x + 2][y + 1] = c;
        vobj[x + 3][y + 1] = c;
      } else if (d == 1) {
        vobj[x][y] = c;
        vobj[x][y + 1] = c;
        vobj[x][y + 2] = c;
        vobj[x][y + 3] = c;
        vobj[x + 1][y] = c;
        vobj[x + 1][y + 1] = c;
        vobj[x + 1][y + 2] = c;
        vobj[x + 1][y + 3] = c;
      }
    }

    int startColor;
    startColor = vobj[xs - 1][ys - 1];
    queue<cordinate> que;

    cordinate obj;
    obj.x = xs - 1;
    obj.y = ys - 1;
    que.push(obj);
    bool flag = false;
    while (1) {
      if (startColor == 0) {
        break;
      }
      cordinate buf;
      buf = que.front();
      que.pop();

      int bx;
      int by;
      bx = buf.x;
      by = buf.y;
      if (bx == xg - 1 && by == yg - 1) {
        flag = true;
        break;
      }
      for (int i = 0; i < 4; i++) {
        if (bx + dx[i] >= 0 && bx + dx[i] <= h - 1) {
          if (by + dy[i] >= 0 && by + dy[i] <= w - 1) {
            if (vobj[bx + dx[i]][by + dy[i]] == startColor) {
              cordinate newObject;
              newObject.x = bx + dx[i];
              newObject.y = by + dy[i];
              que.push(newObject);
            }
          }
        }
      }
      vobj[bx][by] = -1;

      if (que.size() == 0) {
        break;
      }
    }

    if (flag == true) {
      cout << "OK" << endl;
    } else {
      cout << "NG" << endl;
    }
    /*for(int i = 0; i < w - 1; i++)
    {
            for(int j = 0; j < h - 1; j++)
            {
                    cout << vobj[i][j] << " ";
            }
            cout << endl;
    }  */
  }
}