#include <iostream> #include <vector> using namespace std; int main(){ int res = 0; int n; cin>>n; vector<int> s(n,0); for (int i=0; i<n; i++) cin>>s[i]; vector<bool> ac(n,1); for (int i=0; i<n; i++){ if (!ac[i]) continue; for (int j=i+1; j<n; j++){ if (!ac[j] || abs(s[j])!=abs(s[i])) continue; ac[j] = 0; ac[i] = 0; if (s[i]<0) res+=j-i-1; else res+=j-i; break; } } cout<<res<<'\n'; return 0; }

/usr/bin/ld: /tmp/cctfIDFw.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc4B2i3y.o:shoes.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cctfIDFw.o: in function `main':
grader.cpp:(.text.startup+0x2a8): undefined reference to `count_swaps(std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status