oj.uz

Submission #1009288

# Submission time Handle Problem Language Result Execution time Memory
1009288 2024-06-27T10:57:37 Z PoPularPlusPlus Triple Jump (JOI19_jumps) C++17
100 / 100
 1004 ms 87940 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb(x) push_back(x)
#define mp(x,y) make_pair(x,y)
#define all(x) x.begin(),x.end()
#define vf first 
#define vs second
const int mod = 1000000007;
 
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

struct Seg{
	vector<int> mx,ans;
	vector<int> lazy;
	int siz;

	void init(int n){
		siz = 1;
		while(siz < n)siz*=2;

		mx.assign(siz * 2 , 0);
		ans.assign(siz * 2 , 0);
		lazy.assign(siz * 2 , -1);
	}

	void push(int x){
		lazy[2 * x + 1] = max(lazy[2 * x + 1] , lazy[x]);
		lazy[2 * x + 2] = max(lazy[2 * x + 2] , lazy[x]);
		ans[2 * x + 1] = max(ans[2 * x + 1] , lazy[2 * x + 1] + mx[2 * x + 1]);
		ans[2 * x + 2] = max(ans[2 * x + 2] , lazy[2 * x + 2] + mx[2 * x + 2]);
		lazy[x] = -1;
	}

	void build(vector<int>& a , int x , int lx , int rx){
		if(rx - lx == 1){
			if(lx < a.size()){
				mx[x] = ans[x] = a[lx];
			}
			return;
		}
		int m = (lx + rx)/2;
		build(a , 2 * x + 1 ,lx , m);
		build(a , 2 * x + 2 , m , rx);
		mx[x] = max(mx[2 * x + 1] , mx[2 * x + 2]);
		ans[x] = max(ans[2 *x + 1] , ans[2 * x + 2]);
	}

	void build(vector<int>& a){
		build(a , 0 , 0 , siz);
	}

	void set(int l , int r, int val, int x , int lx, int rx){
		if(r <= lx || rx <= l)return;
		if(lx >= l && rx <= r){
			lazy[x] = max(lazy[x], val);
			ans[x] = max(ans[x] , mx[x] + val);
			return;
		}

		push(x);
		int m = (lx + rx)/2;
		set(l , r , val , 2 * x + 1, lx , m);
		set(l , r , val , 2 * x + 2 , m , rx);
		ans[x] = max(ans[2 * x + 1] , ans[2 * x + 2]);
	}

	void set(int l , int r , int val){
		set(l , r , val , 0 , 0 , siz);
	}

	int range_op(int l , int r , int x , int lx, int rx){
		if(rx <= l || r <= lx)return -1;
		if(lx >= l && rx <= r){
			return ans[x];
		}

		push(x);
		int m = (lx + rx)/2;
		return max(range_op(l , r , 2 * x + 1 , lx , m) , range_op(l , r , 2 * x + 2 , m , rx));
	}

	int range_op(int l ,int r){
		return range_op(l , r , 0 , 0 ,siz);
	}
};

void solve(){
	int n;
	cin >> n;
	vector<int> a(n);
	for(int i = 0; i < n; i++){
		cin >> a[i];
	}
	Seg st;
	st.init(n + 1);
	st.build(a);

	stack<int> stk;
	vector<int> right[n + 1];
	for(int i = 0; i < n; i++){
		while(stk.size() && a[stk.top()] < a[i]){
			stk.pop();
		}
		if(stk.size()){
			//cout << stk.top() << ' ' << i << '\n';
			right[stk.top()].pb(i);
		}
		stk.push(i);
	}

	while(stk.size())stk.pop();

	for(int i = n - 1; i >= 0; i--){
		while(stk.size() && a[stk.top()] < a[i]){
			stk.pop();
		}
		if(stk.size()){
			//cout << stk.top() << ' ' << i << '\n';
			right[i].pb(stk.top());
		}
		stk.push(i);
	}

	int q;
	cin >> q;
	vector<pair<int,int>> queries[n + 1];
	int ans[q];
	for(int i = 0; i < q; i++){
		int l , r;
		cin >> l >> r;
		l--;
		r--;
		queries[l].pb(mp(r , i));
	}

	for(int i = n - 1; i >= 0; i--){
		for(int j : right[i]){
			int r = j + (j - i);
			if(r < n){
				st.set(r , n , a[i] + a[j]);
			}
		}
		for(auto j : queries[i]){
			ans[j.vs] = st.range_op(i , j.vf + 1);
		}
	}
	for(int i = 0; i < q; i++){
		cout << ans[i] << '\n';
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	//int t;
	//cin >> t;
	//while(t--)
		solve();
}

Compilation message

jumps.cpp: In member function 'void Seg::build(std::vector<int>&, int, int, int)':
jumps.cpp:37:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |    if(lx < a.size()){
      |       ~~~^~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 215 ms 19536 KB Output is correct
12 Correct 197 ms 19492 KB Output is correct
13 Correct 200 ms 19600 KB Output is correct
14 Correct 211 ms 19540 KB Output is correct
15 Correct 197 ms 19540 KB Output is correct
16 Correct 208 ms 19016 KB Output is correct
17 Correct 206 ms 18984 KB Output is correct
18 Correct 203 ms 18896 KB Output is correct
19 Correct 201 ms 19496 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 188 ms 24916 KB Output is correct
2 Correct 115 ms 25628 KB Output is correct
3 Correct 105 ms 25620 KB Output is correct
4 Correct 186 ms 24912 KB Output is correct
5 Correct 178 ms 24924 KB Output is correct
6 Correct 186 ms 24140 KB Output is correct
7 Correct 179 ms 24144 KB Output is correct
8 Correct 176 ms 24148 KB Output is correct
9 Correct 191 ms 24660 KB Output is correct

Subtask #4
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 215 ms 19536 KB Output is correct
12 Correct 197 ms 19492 KB Output is correct
13 Correct 200 ms 19600 KB Output is correct
14 Correct 211 ms 19540 KB Output is correct
15 Correct 197 ms 19540 KB Output is correct
16 Correct 208 ms 19016 KB Output is correct
17 Correct 206 ms 18984 KB Output is correct
18 Correct 203 ms 18896 KB Output is correct
19 Correct 201 ms 19496 KB Output is correct
20 Correct 188 ms 24916 KB Output is correct
21 Correct 115 ms 25628 KB Output is correct
22 Correct 105 ms 25620 KB Output is correct
23 Correct 186 ms 24912 KB Output is correct
24 Correct 178 ms 24924 KB Output is correct
25 Correct 186 ms 24140 KB Output is correct
26 Correct 179 ms 24144 KB Output is correct
27 Correct 176 ms 24148 KB Output is correct
28 Correct 191 ms 24660 KB Output is correct
29 Correct 919 ms 82256 KB Output is correct
30 Correct 666 ms 83536 KB Output is correct
31 Correct 690 ms 81508 KB Output is correct
32 Correct 869 ms 82260 KB Output is correct
33 Correct 907 ms 82256 KB Output is correct
34 Correct 866 ms 79996 KB Output is correct
35 Correct 878 ms 79488 KB Output is correct
36 Correct 1004 ms 79696 KB Output is correct
37 Correct 906 ms 80936 KB Output is correct
38 Correct 735 ms 87940 KB Output is correct
39 Correct 784 ms 87892 KB Output is correct
40 Correct 703 ms 84628 KB Output is correct
41 Correct 680 ms 84048 KB Output is correct
42 Correct 746 ms 84048 KB Output is correct
43 Correct 714 ms 85844 KB Output is correct
44 Correct 728 ms 87264 KB Output is correct
45 Correct 767 ms 87264 KB Output is correct
46 Correct 715 ms 84160 KB Output is correct
47 Correct 728 ms 83596 KB Output is correct
48 Correct 710 ms 83596 KB Output is correct
49 Correct 737 ms 86016 KB Output is correct
50 Correct 785 ms 85332 KB Output is correct
51 Correct 909 ms 85332 KB Output is correct
52 Correct 784 ms 82876 KB Output is correct
53 Correct 822 ms 82512 KB Output is correct
54 Correct 829 ms 82512 KB Output is correct
55 Correct 793 ms 84304 KB Output is correct