Please help me to find mistake in my approach

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Index out of bounds error with sample input:

[simon@simon-laptop][19:14:00]
[~/devel/hackerrank/otherpeoples]>./compile-latest-cpp.sh 
Compiling prince_000-KMAX2.cpp
+ g++ -std=c++14 prince_000-KMAX2.cpp -O3 -g3 -Wall -Wextra -Wconversion -DONLINE_JUDGE -D_GLIBCXX_DEBUG -fsanitize=undefined -ftrapv -fno-sanitize-recover
+ set +x
Successful
[simon@simon-laptop][19:14:05]
[~/devel/hackerrank/otherpeoples]>echo "1
5 3
1 2 3 4 5
" | ./a.out
/usr/include/c++/7/debug/vector:417:
Error: attempt to subscript container with out-of-bounds index 5, but 
container only holds 5 elements.

Objects involved in the operation:
    sequence "this" @ 0x0x7ffe1adcc8c0 {
      type = std::__debug::vector<int, std::allocator<int> >;
    }
Aborted (core dumped)
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Thank you very much sir , for your help