Here is my code. When compiling using g++ 12.1.0 on my local machine or using GNU G++ 20 on the judging machine, it always stop the input after the first loop of the first loop. Like it showns here. With the debug code, it output something like this where lines start with > is my input.

But when compiling with Clang++ on my local machine or on judge machine, it works well.

P.S. please ignore the WA on clang++, it is caused by making too many queries, which can be solved using binary search but I've not implement that yet.