Suggestions for properly iterating through a vector?

It looks like there are at least one or two places you access end which is past the end of your container. Instead of trying to fix the somewhat convoluted logic, I'd suggest one of.

This isn't really an answer per-say but just to help clarify to the OP what I meant in my comment.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.