Submission #1274717

#TimeUsernameProblemLanguageResultExecution timeMemory
1274717nthvnHedgehog Daniyar and Algorithms (IZhO19_sortbooks)C++20
0 / 100
1270 ms30500 KiB
#include "bits/stdc++.h"
using namespace std;

#define LOG(n) (63 - __builtin_clzll((n)))
#define fi first
#define se second
#define pii pair<int,int> 
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define pb push_back
#define ll long long
const int N = 1e6+5;
int n,q;
int a[N];
int R[N], vR[N];

struct SegTree{
	struct Node{
		int best, mx;
		void combine(Node l, Node r){
			best = max(l.best, r.best);
			if(R[l.mx]>=r.mx) {
				best= max(best, a[l.mx]+ a[r.mx]);
			}
			else{
				if(vR[l.mx]) best= max(best, a[l.mx]+ vR[l.mx]);
			}
			if(a[l.mx]>= a[r.mx]) mx = l.mx;
			else mx = r.mx;
		}
	}tr[4*N];
	void build(int id, int l, int r){
		if(l==r){
			tr[id].best = 0;
			tr[id].mx =l;
			return;
		}
		int mid =(l+r)>>1;
		build(2*id,l,mid);
		build(2*id+1,mid+1,r);
		tr[id].combine(tr[2*id],tr[2*id+1]);
	}
	Node get(int id, int l, int r, int t_l, int t_r){
		Node ans;
		if(l>t_r||r<t_l) return ans;
		if(t_l<=l&&r<=t_r) return tr[id];
		int mid=(l+r)>>1;
		ans.combine(get(2*id,l,mid,t_l,t_r), get(2*id+1,mid+1,r,t_l,t_r));
		return ans;
	}
}st;

void precalc(){
	stack<int> st;
	for(int i=n;i>=1;i--){
		while(!st.empty()&&a[st.top()]<a[i]){
			vR[i] = max(vR[i], a[st.top()]);
			st.pop();
		}
		if(st.empty())R[i] = n;
		else R[i] = st.top()-1;
		st.push(i);
	}
}

signed main(){
	ios_base::sync_with_stdio(NULL);
	cin.tie(NULL);
	if(fopen("TASK.INP", "r")){
		freopen("TASK.INP", "r", stdin);
		freopen("TASK.OUT", "w", stdout);
	}
	cin>>n>>q;
	for(int i=1;i<=n;i++) cin>>a[i];
	precalc();
	st.build(1,1,n);
	
	while(q--){
		int l,r,k; cin>>l>>r>>k;
		int f= st.get(1,1,n,l,r).best;
		cout<<(f<=k)<<"\n";
	}
	
	
}

Compilation message (stderr)

sortbooks.cpp: In function 'int main()':
sortbooks.cpp:70:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |                 freopen("TASK.INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sortbooks.cpp:71:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |                 freopen("TASK.OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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