boxes.cpp: In function 'int delivery(int, int, int, std::vector<int>)':
boxes.cpp:10:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<pos.size();i++)
~^~~~~~~~~~~
boxes.cpp:5:19: warning: unused parameter 'n' [-Wunused-parameter]
int delivery( int n , int k , int l , vector<int> pos)
^
/tmp/ccbmzF7k.o: In function `main':
grader.c:(.text.startup+0x22f): undefined reference to `delivery(int, int, int, int*)'
collect2: error: ld returned 1 exit status