books.cpp: In function 'long long int skim(int)':
books.cpp:5:1: warning: no return statement in function returning non-void [-Wreturn-type]
5 | }
| ^
/usr/bin/ld: /tmp/ccQ9obSo.o: in function `answer(std::vector<int, std::allocator<int> >)':
grader.cpp:(.text+0xa0): multiple definition of `answer(std::vector<int, std::allocator<int> >)'; /tmp/ccAOGLnS.o:books.cpp:(.text+0x0): first defined here
/usr/bin/ld: /tmp/ccQ9obSo.o: in function `impossible()':
grader.cpp:(.text+0x160): multiple definition of `impossible()'; /tmp/ccAOGLnS.o:books.cpp:(.text+0x10): first defined here
/usr/bin/ld: /tmp/ccQ9obSo.o: in function `skim(int)':
grader.cpp:(.text+0x1a0): multiple definition of `skim(int)'; /tmp/ccAOGLnS.o:books.cpp:(.text.unlikely+0x0): first defined here
collect2: error: ld returned 1 exit status