I would really appreciate if anybody could roughly give the approach to the solving the questions\nQuestion 1:\n![image](https://assets.leetcode.com/users/images/11797daf-0624-438a-8bd5-ed9a898341a3_1596303134.8820345.png)\n![image](https://assets.leetcode.com/users/images/76ac0155-fa70-4058-a8fd-dfef7f28f720_1596303135.5185754.png)\n![image](https://assets.leetcode.com/users/images/766458bd-b44a-4085-8fe4-f000fa35828d_1596303135.756296.png)\n\nQuestion 2:\n![image](https://assets.leetcode.com/users/images/2ba4550f-547d-4f97-848f-737f9098c875_1596303173.163809.png)\n![image](https://assets.leetcode.com/users/images/48021512-0116-4d79-a58d-0c9ba1e00833_1596303173.8272233.png)\n\nQuestion 3:\n![image](https://assets.leetcode.com/users/images/23820068-6b9d-45fc-bdaa-3043efd6a0b9_1596303184.7204046.png)\n![image](https://assets.leetcode.com/users/images/d6f58438-cdee-4f3d-a443-547e38063808_1596303184.6963391.png)\n![image](https://assets.leetcode.com/users/images/d4162eaa-289f-4d01-82b1-7c91de8a088a_1596303191.1590526.png)\n\n\n

I would really appreciate if anybody could roughly give the approach to the solving the questions\nQuestion 1:\n\n\n\n\nQuestion 2:\n\n\n\nQuestion 3:\n\n\n\n\n