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  lengocphuc  commented on Feb. 28, 2025, 9:06 a.m.

  include <bits/stdc++.h>

  define ll long long

  define fr(i, a, b) for (int i = a; i <= b; i++)

  using namespace std; int a[30000+3],n; void doc() { cin>>n; fr(i,1,n) cin>>a[i]; } void xuly() { int res =n; for(int i=n;i>=1;i--) { if(res ==a[i]) res--; } cout << res; } int main() { doc(); xuly(); return 0; }

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  lengocphuc  commented on Feb. 28, 2025, 9:05 a.m.

  include <bits/stdc++.h>

  define ll long long

  define fr(i, a, b) for (int i = a; i <= b; i++)

  using namespace std; int a[300003],n; void doc() { cin>>n; fr(i,1,n) cin>>a[i]; } void xuly() { int res =n; for(int i=n;i>=1;i--) { if(res ==a[i]) res--; } cout << res; } int main() { doc(); xuly(); return 0; }