Submission #339767

#	Time	Username	Problem	Language	Result	Execution time	Memory
339767		amunduzbaev	Crazy old lady (IZhO13_crazy)	C++14	0 / 100	1 ms	364 KiB

crazy

/** made by amunduzbaev **/

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
#include <ext/rope>

using namespace __gnu_pbds;
using namespace __gnu_cxx;
using namespace std;

#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vll vector<ll>
#define vii vector<int>
#define vpii vector<pii>
#define vpll vector<pll>
#define cnt(a)__builtin_popcount(a)
template<class T> bool umin(T& a, const T& b) {return a > b? a = b, true:false;}
template<class T> bool umax(T& a, const T& b) {return a < b? a = b, true:false;}

typedef tree<pii,null_type,less<pii>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int N = 1e3+5;
const int mod = 1e9+7;
const ll inf = 1e18;
const ld Pi = acos(-1);
ll n, m, ans, k, a[N], used[N];

void solve(){
	vpii nn;
	cin>>n>>a[1];
	used[a[1]] = 1;
	ans = 0;
	nn.pb({1, 1});
	for(int i=2;i<=n;i++){
		cin>>a[i];
		if(a[i] != i-1 && a[i] != i){
			if(used[i]) nn.pb({i, i});
			else nn.pb({i, i-1});
		}used[a[i]] = 1;
	}
	if(sz(nn) != 1) for(int i=0;i<sz(nn);i++) ans = a[nn[i].ff];
	cout<<ans<<"\n";
	return;
}

int main(){
	fastios
	int t = 0;
	if(t) solve();
	else {
		cin>>t;
		while (t--) solve();
	}
	return 0;
}
 

• Subtask 1: 0 / 100