Submission #342814

#	Time	Username	Problem	Language	Result	Execution time	Memory
342814		Tosic	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++14	17 / 100	638 ms	64108 KiB

sortbooks

#include <bits/stdc++.h>
#define maxn 800010
using namespace std;

int n, m, a[maxn], ans;

struct node
{
	int maxS, minS, res;
	node(){
		maxS = 0;
		minS = 1e9+10;
		res = 0;
	}
};

node segTree[maxn];
vector<int> sorted[maxn];

void init(int idx, int l, int r){
	//cerr<< idx<< '\n';
	if(l == r){
		segTree[idx].maxS = segTree[idx].minS = a[l];
		//cerr<< 'a';
		sorted[idx].clear();
		sorted[idx]={a[l]};
		//cerr<<'b';
		return;
	}
	int mid = (r+l)/2;
	init(idx*2+1, l, mid);
	init(idx*2+2, mid+1, r);
	//cerr<< sorted[idx*2+1].size( ) << '\n';
	segTree[idx].maxS = max(segTree[idx*2+1].maxS, segTree[idx*2+2].maxS);
	segTree[idx].minS = min(segTree[idx*2+1].minS, segTree[idx*2+2].minS);
	segTree[idx].res = max(segTree[idx*2+1].res, segTree[idx*2+2].res);
	int n1  =sorted[idx*2+1].size(), m1 = sorted[idx*2+2].size();
	//cerr<< sorted[idx*2+1].size() << '\n';
	sorted[idx].clear();
	sorted[idx].resize(sorted[idx*2+1].size()+sorted[idx*2+2].size());
	merge(sorted[idx*2+1].begin(), sorted[idx*2+1].end(), sorted[idx*2+2].begin(), sorted[idx*2+2].end(), sorted[idx].begin());
	// for(int i = 0, j = 0; i < n1 and j < m1; i = min(i, n1-1), j  =min(j, m1-1)){
	// 	int a = sorted[idx*2+1][i], b = sorted[idx*2+2][j];
	// 	if(a < b){
	// 		sorted[idx].push_back(a);
	// 		++i;
	// 	} else {
	// 		sorted[idx].push_back(b);
	// 		++j;
	// 	}
	// } //cerr<< 'a' << '\n';
	int tmp = lower_bound(sorted[idx*2+2].begin(), sorted[idx*2+2].end(), segTree[idx*2+1].maxS) - sorted[idx*2+2].begin();
	--tmp;
	if(tmp >= 0){
		segTree[idx].res = max(segTree[idx].res, sorted[idx*2+2][tmp] + segTree[idx*2+1].maxS);
	}
}

vector<int> allIx;

int query(int idx, int l, int r, int ql, int qr){
	if(l >= ql and r <= qr){
		allIx.push_back(idx);
		return segTree[idx].res;
	}
	if(l > qr or r<ql){
		return 0;
	}
	int mid = (l+r)/2;
	return max(query(idx*2+1, l, mid, ql, qr),query(idx*2+2, mid+1, r, ql, qr));
}

int main(){
	ios_base::sync_with_stdio(0);
	cout.tie(0);
	cin.tie(0);
	cin >> n >> m;
	for(int i = 0; i < n; ++i){
		cin >> a[i];
	}
	init(0, 0, n-1);
	for(int i = 0; i < m; ++i){
		int l,r,k;
		cin>>l>>r>>k;
		--l, --r;
		if(l == r){
			cout << "1\n";
			continue;
		}
		allIx.clear();
		if(n <= 5000){
			int tmp = 0,res = 0;
			for(int i=l; i <= r; ++i){
				if(tmp > a[i]){
					res = max(res, tmp+a[i]);
				}
				
				tmp = max(tmp, a[i]);
			}
			cout << (res<=k) << '\n';
			continue;
		}
		int tmp = query(0,0, n-1,l,r), pr = 0;
		for(auto j:allIx){
			int tmpIdx=lower_bound(sorted[j].begin(), sorted[j].end(),pr)-sorted[j].begin();
			--tmpIdx;
			if(tmpIdx >= 0){
				tmp = max(sorted[j][tmpIdx] + pr, tmp);
			}
			pr = sorted[j].back();
		}
		cout << (tmp<=k) << '\n';
	}
}

Compilation message (stderr)

sortbooks.cpp: In function 'void init(int, int, int)':
sortbooks.cpp:37:6: warning: unused variable 'n1' [-Wunused-variable]
   37 |  int n1  =sorted[idx*2+1].size(), m1 = sorted[idx*2+2].size();
      |      ^~
sortbooks.cpp:37:35: warning: unused variable 'm1' [-Wunused-variable]
   37 |  int n1  =sorted[idx*2+1].size(), m1 = sorted[idx*2+2].size();
      |                                   ^~

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23