boxes.cpp: In function 'int delivery(int, int, int, std::vector<int>)':
boxes.cpp:5:18: warning: unused parameter 'n' [-Wunused-parameter]
int delivery(int n, int k, int l, vector<int> positions){
^
boxes.cpp:5:25: warning: unused parameter 'k' [-Wunused-parameter]
int delivery(int n, int k, int l, vector<int> positions){
^
boxes.cpp:5:32: warning: unused parameter 'l' [-Wunused-parameter]
int delivery(int n, int k, int l, vector<int> positions){
^
boxes.cpp:5:47: warning: unused parameter 'positions' [-Wunused-parameter]
int delivery(int n, int k, int l, vector<int> positions){
^~~~~~~~~
/tmp/ccwlIZuL.o: In function `main':
grader.c:(.text.startup+0x22f): undefined reference to `delivery(int, int, int, int*)'
collect2: error: ld returned 1 exit status