perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:26:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
26 | for(int i=0; i<arr.size(); i++, x++)
| ~^~~~~~~~~~~
perm.cpp:31:38: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
31 | for(int j=0, k=x-1, l=0, p = 0; j<x; j++, p++){
| ~^~
/usr/bin/ld: /tmp/ccKPWRSc.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccHgZm2f.o:perm.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status