Submission #690544

#	Time	Username	Problem	Language	Result	Execution time	Memory
690544		mansur	Crazy old lady (IZhO13_crazy)	C++17	100 / 100	10 ms	368 KiB

crazy

//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")

#include<bits/stdc++.h>	

using namespace std;

#define all(a) a.begin(), a.end()                                                   
#define rall(a) a.rbegin(), a.rend()                 
#define sz(a) (int)a.size()
#define pf push_front
#define pb push_back
#define vt vector
#define s second
#define f first
#define nl '\n'
 
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
     
vt<pii> rid = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
vt<pii> dir = {{-1, -1}, {-1, 1}, {1, -1}, {1, 1}};
 
const int N = 1e5, mod = 998244353;

const ll inf = 1e9;
 
double eps = 1e-15;
                        
bool fl = 1;

void slv() {
	int n;
	cin >> n;
	int p[n + 1];
	for (int i = 1; i <= n; i++) cin >> p[i];
	int cnt = 0, ans = 0;
	for (int x = 1; x <= n; x++) {
		vt<bool> was(n + 1);
		was[p[1]] = 1;
		bool ok = 1;
	 	for (int i = 1, j = 2; i <= n; i++) {
			if (i == x) continue;
			if (!was[i]) {
			 	if (p[j] !=	i) {
			 		ok = 0;
					break;
				}
				was[i] = 1;
			}else {
				if (was[p[j]]) {
					ok = 0;
					break;
				}
				was[p[j]] = 1;
			}
			j++;		
	 	}
	 	if (ok) {
	 	    if (cnt == 1) {
	 	    	cout << 0 << nl;  
	 	    	return;
	 	    }
	 		cnt++;
	 		ans = x;
		}
	}
	cout << ans << nl;
}                        
 
main() {
	//freopen("shops.in", "r", stdin);                                                                                     
	//freopen("shops.out", "w", stdout);                                                                                     
	ios_base::sync_with_stdio(0);	                                                                                       
	cin.tie(0);
	int tp = 1;
	if (fl) cin >> tp;
	while (tp--) {  	
		slv();
	}
}                                               

Compilation message (stderr)

crazy.cpp:74:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   74 | main() {
      | ^~~~

• Subtask 1: 100 / 100