Submission #698302

#	Time	Username	Problem	Language	Result	Execution time	Memory
698302		blackscreen1	Alternating Heights (CCO22_day1problem1)	C++17	25 / 25	357 ms	23448 KiB

Main

#include <bits//stdc++.h>
using namespace std;
#define ll long long
#define st short
#define iloop(m, h) for (auto i = m; i != h; i+=(m<h?1:-1))
#define jloop(m, h) for (auto j = m; j != h; j+=(m<h?1:-1))
#define kloop(m, h) for (auto k = m; k != h; k+=(m<h?1:-1))
#define lloop(m, h) for (auto l = m; l != h; l+=(m<h?1:-1))
#define iloop_(m, h, g) for (auto i = m; i != h; i+=g)
#define jloop_(m, h, g) for (auto j = m; j != h; j+=g)
#define kloop_(m, h, g) for (auto k = m; k != h; k+=g)
#define lloop_(m, h, g) for (auto l = m; l != h; l+=g)
#define getchar_unlocked _getchar_nolock // comment before submission
#define pll pair<ll,ll>
#define plll pair<ll, pll>
#define pllll pair<pll, pll>
#define vll vector<ll>
#define qll queue<ll>
#define dll deque<ll>
#define pqll priority_queue<ll>
#define gll greater<ll>
#define INF 1000000000000000
#define MOD1 1000000007
#define MOD2 998244353
#define MOD3 1000000009
mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
ll n, m, t;
ll adjmat[3005][3005];
ll vis[3005];
bool dfs(ll nd) {
	vis[nd] = 1;
	iloop(0, m) {
		if (adjmat[nd][i] && vis[i] == 1) return 0;
		if (adjmat[nd][i] && vis[i] == 0) if (dfs(i) == 0) return 0;
	}
	vis[nd] = 2;
	return 1;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> m >> t;
    ll a[n];
    iloop(0, n) {cin >> a[i]; a[i]--;}
    ll lptr = 0;
    ll ans[n];
    iloop(0, n) {
		if (i != 0) {
			if (i%2 == 1) {
				adjmat[a[i]][a[i-1]]++;
			}
			else {
				adjmat[a[i-1]][a[i]]++;
			}
		}
		while (1) {
			memset(vis, 0, sizeof(vis));
			if (dfs(a[i]) == 1) break;
			lptr++;
			if (lptr%2 == 1) {
				adjmat[a[lptr]][a[lptr-1]]--;
			}
			else {
				adjmat[a[lptr-1]][a[lptr]]--;
			}
		}
		ans[i] = lptr;
	}
	ll a1, b1;
	iloop(0, t) {
		cin >> a1 >> b1;
		a1--, b1--;
		if (ans[b1] > a1) cout << "NO\n";
		else cout << "YES\n";
	}
}

• Subtask 1: 4 / 4
• Subtask 2: 6 / 6
• Subtask 3: 7 / 7
• Subtask 4: 8 / 8