#include <bits/stdc++.h>
using namespace std;
int valid(int n, int S[]){
vector<int> ns;
set<int> s; for(int i=0; i<n; i++) s.insert(S[i]); if (s.size()<n) return 0;
int ind = -1;
for (int i=0; i<n; i++) if (S[i] <= n) {ind = i; break;}
if (ind == -1) return 1;
int t = S[ind];
for (int i=ind+1; i!=ind; i++, i%=n){
t++; if (t==n+1) t = 1;
if (S[i] <= n && S[i] != t) return 0;
}
return 1;
}
// int main(){
// int S[] ={1, 5, 3, 4, 2, 7, 6};
// cout<<valid(7,S);
// }
int replacement(int n, int gondolaSeq[], int replacementSeq[]);
int countReplacement(int n, int inputSeq[]);
Compilation message
gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:7:65: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
7 | set<int> s; for(int i=0; i<n; i++) s.insert(S[i]); if (s.size()<n) return 0;
| ~~~~~~~~^~
/usr/bin/ld: /tmp/ccksNIEJ.o: in function `main':
grader.cpp:(.text.startup+0xb6): undefined reference to `valid'
/usr/bin/ld: grader.cpp:(.text.startup+0x108): undefined reference to `countReplacement'
/usr/bin/ld: grader.cpp:(.text.startup+0x132): undefined reference to `replacement'
collect2: error: ld returned 1 exit status
