Submission #891795

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Source Code Expand

#include <bits/stdc++.h>
#define int long long
#define range(i,x,y) i=(x);i<(y);i++
#define rep(i,n) for(int i=0,i##_len=n;i<i##_len;i++)
#define all(x) begin(x),end(x)
#define lim(x,r,l) (r<=x&&x<l)
typedef long long ll;
typedef long double ld;
using namespace std;

signed main(){
  int n; cin >> n;
  vector<int> a(n);
  rep(i, n){
    cin >> a[i];
  }
  int res = 0;
  rep(i, n){
    if(a[a[i]-1]-1 == i){
      res ++;
    }
  }
  cout << res/2 << endl;
}

Submission Info

Compile Error

./Main.rb:19: syntax error, unexpected '{', expecting keyword_then or ';' or '\n'
    if(a[a[i]-1]-1 == i){
                         ^
./Main.rb:20: warning: `+' after local variable or literal is interpreted as binary operator
./Main.rb:20: warning: even though it seems like unary operator
./Main.rb:20: syntax error, unexpected ';'
      res ++;
             ^
./Main.rb:13: warning: possibly useless use of > in void context
./Main.rb:24: syntax error, unexpected end-of-input, expecting '}'

Judge Result