doll.cpp:1:9: warning: #pragma once in main file
1 | #pragma once
| ^~~~
/usr/bin/ld: /tmp/ccR63PDo.o: in function `answer(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)':
grader.cpp:(.text+0x1e0): multiple definition of `answer(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'; /tmp/ccIjz6YR.o:doll.cpp:(.text+0x1e0): first defined here
/usr/bin/ld: /tmp/ccR63PDo.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccIjz6YR.o:doll.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status