Help in solution approach

Правка en1, от Dr_John_WATSON, 2022-06-29 17:20:21

Can anybody please help me with this problem. I am not able to understand editorial also. Any other solution approaches are also welcomed. Thanks

Problem link: problem 402C

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en2 Английский Dr_John_WATSON 2022-06-29 17:21:02 2 Tiny change: '[problem 402C](https:/' -> '[problem 420C](https:/'
en1 Английский Dr_John_WATSON 2022-06-29 17:20:21 252 Initial revision (published)