Submission #971372

#	Time	Username	Problem	Language	Result	Execution time	Memory
971372		KiaRez	Alternating Heights (CCO22_day1problem1)	C++17	25 / 25	275 ms	24276 KiB

Main

/*
    IN THE NAME OF GOD
*/
#include <bits/stdc++.h>

// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef long double ld;

#define F                                      first
#define S                                      second
#define Mp                                     make_pair
#define pb                                     push_back
#define pf                                     push_front
#define size(x)                                ((ll)x.size())
#define all(x)                                 (x).begin(),(x).end()
#define kill(x)		                           cout << x << '\n', exit(0);
#define fuck(x)                                cout << "(" << #x << " , " << x << ")" << endl
#define endl                                   '\n'

const int N = 3e5+23, lg = 18;
ll Mod = 1e9+7; //998244353;

inline ll MOD(ll a, ll mod=Mod) {a%=mod; (a<0)&&(a+=mod); return a;}
inline ll poww(ll a, ll b, ll mod=Mod) {
    ll ans = 1;
    a=MOD(a, mod);
    while (b) {
        if (b & 1) ans = MOD(ans*a, mod);
        b >>= 1;
        a = MOD(a*a, mod);
    }
    return ans;
}

int n, k, q, a[N], deg[N], ptr, res[N];
vector<int> adj[N];

bool check(int x, int y) {
    int wh = 0;
    for(int i=x; i<y; i++) {
        if(wh == 0) deg[a[i]]++, adj[a[i+1]].pb(a[i]);
        else deg[a[i+1]]++, adj[a[i]].pb(a[i+1]);
        wh^=1;
    }
    queue<int> qu;
    for(int i=1; i<=k; i++) if(deg[i] == 0) qu.push(i);
    int cnt = 0;
    while(size(qu) > 0) {
        int v = qu.front(); qu.pop(); cnt++;
        for(auto it : adj[v]) {
            deg[it] --;
            if(deg[it] == 0) qu.push(it);
        }
    }
    for(int i=1; i<=k; i++) {
        deg[i]=0; adj[i].clear();
    }
    return (cnt == k);
}

int main () {
	ios_base::sync_with_stdio(false), cin.tie(0);

	cin>>n>>k>>q;
    for(int i=1; i<=n; i++) cin>>a[i];
    ptr=1;
    for(int i=1; i<=n; i++) {
        while(check(ptr, i) == 0) ptr++;
        res[i] = ptr;
    }

    while(q--) {
        int x,y; cin>>x>>y;
        if(res[y] <= x) cout<<"YES\n";
        else cout<<"NO\n";
    }

	return 0;
}

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