boxes.cpp: In function 'long long int delivery(long long int, long long int, long long int, long long int*)':
boxes.cpp:14:7: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
cx += K;
~~~^~~~
boxes.cpp:17:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int j = 0; j < vec.size(); j++) {
~~^~~~~~~~~~~~
/tmp/ccbTQwVr.o: In function `main':
grader.c:(.text.startup+0x22f): undefined reference to `delivery(int, int, int, int*)'
collect2: error: ld returned 1 exit status