class Solution {
public:
    bool reachingPoints(int sx, int sy, int tx, int ty) {
        while (tx > 0 && ty > 0)
        {
            if (tx < sx || ty < sy)return false;
            if (tx == sx && ty == sy)return true;
            if (ty >= tx)ty -= tx;
            else if (tx > ty) tx -= ty;
        }
        return false;
    }
};