Do you consider the case where the index of the maximum number is not contained in the given sets? For example, consider array $$$a$$$ to be $$$[3, 2, 7, 3, 5]$$$ and $$$k = 2$$$ sets being {$$$1, 2$$$} and {$$$4, 5$$$}. Ans should be $$$7, 7$$$.

Edit: Ignore the above, you do.

Found your mistake, it was a really subtle one. In line 84, you have an if statement with the following condition adj[i][j]==ask. However, you never consider that j can be greater than adj[i].size(). Added that and got AC 82269561.