oj.uz

답안 #742695

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
742695 2023-05-16T18:11:55 Z myrcella 3단 점프 (JOI19_jumps) C++17
100 / 100
 666 ms 67876 KB 
//by szh
#include<bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf 0x3f
#define rep(i,a,b) for (int i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define ll long long
#define mod 1000000007
#define ALL(x) x.begin(),x.end()
void inc(int &a,int b) {a=(a+b)%mod;}
void dec(int &a,int b) {a=(a-b+mod)%mod;}
int lowbit(int x) {return x&(-x);}
ll p0w(ll base,ll p) {ll ret=1;while(p>0){if (p%2ll==1ll) ret=ret*base%mod;base=base*base%mod;p/=2ll;}return ret;}

const int maxn = 5e5+10;

int n;
int a[maxn];
deque <int> q;
vector <int> good[maxn];
pii tree[maxn*4];
int add[maxn*4];
vector <pair<pii,int> > que;
int ans[maxn];

void init(int c,int cl,int cr) {
	if (cl==cr) tree[c] = {a[cl],a[cl]},add[c] = 0;
	else {
		int mid=cl+cr>>1;
		init(c<<1,cl,mid);
		init(c<<1|1,mid+1,cr);
		int tmp = max(tree[c<<1].fi,tree[c<<1|1].fi);
		tree[c] = {tmp,tmp};
	}
	
}

void push_down(int c) {
	tree[c<<1].fi = max(tree[c<<1].fi,tree[c<<1].se+add[c]);
	add[c<<1] = max(add[c<<1],add[c]);
	tree[c<<1|1].fi = max(tree[c<<1|1].fi,tree[c<<1|1].se+add[c]);
	add[c<<1|1] = max(add[c<<1|1],add[c]);
	add[c] = 0;
}

void update(int c,int cl,int cr,int l,int r,int val) {
	if (l<=cl and cr<=r) {
		tree[c].fi = max(tree[c].fi,tree[c].se+val);
		add[c] = max(add[c],val);
		return;
	}
	int mid=cl+cr>>1;
	if (add[c]!=0) push_down(c);
	if (l<=mid) update(c<<1,cl,mid,l,r,val);
	if (r>mid) update(c<<1|1,mid+1,cr,l,r,val);
	tree[c].fi = max(tree[c<<1].fi,tree[c<<1|1].fi);
	return;
}

int query(int c,int cl,int cr,int l,int r) {
	if (l<=cl and cr<=r) return tree[c].fi;
	int mid=cl+cr>>1;
	if (add[c]!=0) push_down(c);
	int ret = 0;
	if (l<=mid) ret = query(c<<1,cl,mid,l,r);
	if (r>mid) ret = max(ret,query(c<<1|1,mid+1,cr,l,r));
	return ret;
}

int main() {
//	freopen("input.txt","r",stdin);	
	std::ios::sync_with_stdio(false);cin.tie(0);
	cin>>n;
	rep(i,1,n+1) cin>>a[i];
	for (int i=n;i>0;i--) {
		while (!q.empty() and a[q.back()]<=a[i]) good[i].pb(q.back()),q.pop_back();
		if (!q.empty()) good[i].pb(q.back());
		q.push_back(i);
	}
//	rep(i,1,n+1) for (auto it:good[i]) cout<<i<<" "<<it<<endl;
	init(1,1,n);
	int _;cin>>_;
	rep(i,0,_) {
		int l,r;
		cin>>l>>r;
		que.pb({{l,r},i});
	}
	sort(ALL(que));reverse(ALL(que));
	int l=n;
	rep(i,0,_) {
		while (l>=que[i].fi.fi) {
			for (auto r:good[l]) if (r+r-l<=n) update(1,1,n,r+r-l,n,a[l]+a[r]);
			l--;
		}
		ans[que[i].se] = query(1,1,n,que[i].fi.fi,que[i].fi.se);
	}
	rep(i,0,_) cout<<ans[i]<<"\n";
	return 0;
}

Compilation message

jumps.cpp: In function 'void init(int, int, int)':
jumps.cpp:38:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   38 |   int mid=cl+cr>>1;
      |           ~~^~~
jumps.cpp: In function 'void update(int, int, int, int, int, int)':
jumps.cpp:61:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   61 |  int mid=cl+cr>>1;
      |          ~~^~~
jumps.cpp: In function 'int query(int, int, int, int, int)':
jumps.cpp:71:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   71 |  int mid=cl+cr>>1;
      |          ~~^~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 6 ms 11988 KB Output is correct
3 Correct 7 ms 12008 KB Output is correct
4 Correct 7 ms 11988 KB Output is correct
5 Correct 8 ms 11988 KB Output is correct
6 Correct 6 ms 12076 KB Output is correct
7 Correct 6 ms 12080 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 12080 KB Output is correct
10 Correct 7 ms 12076 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 6 ms 11988 KB Output is correct
3 Correct 7 ms 12008 KB Output is correct
4 Correct 7 ms 11988 KB Output is correct
5 Correct 8 ms 11988 KB Output is correct
6 Correct 6 ms 12076 KB Output is correct
7 Correct 6 ms 12080 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 12080 KB Output is correct
10 Correct 7 ms 12076 KB Output is correct
11 Correct 270 ms 27692 KB Output is correct
12 Correct 255 ms 27564 KB Output is correct
13 Correct 252 ms 27584 KB Output is correct
14 Correct 255 ms 27516 KB Output is correct
15 Correct 252 ms 27688 KB Output is correct
16 Correct 257 ms 27020 KB Output is correct
17 Correct 273 ms 26944 KB Output is correct
18 Correct 256 ms 26932 KB Output is correct
19 Correct 260 ms 27564 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 25480 KB Output is correct
2 Correct 69 ms 27712 KB Output is correct
3 Correct 65 ms 26956 KB Output is correct
4 Correct 109 ms 27212 KB Output is correct
5 Correct 108 ms 27192 KB Output is correct
6 Correct 104 ms 26484 KB Output is correct
7 Correct 106 ms 26396 KB Output is correct
8 Correct 106 ms 26448 KB Output is correct
9 Correct 108 ms 26788 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 11988 KB Output is correct
2 Correct 6 ms 11988 KB Output is correct
3 Correct 7 ms 12008 KB Output is correct
4 Correct 7 ms 11988 KB Output is correct
5 Correct 8 ms 11988 KB Output is correct
6 Correct 6 ms 12076 KB Output is correct
7 Correct 6 ms 12080 KB Output is correct
8 Correct 6 ms 11988 KB Output is correct
9 Correct 6 ms 12080 KB Output is correct
10 Correct 7 ms 12076 KB Output is correct
11 Correct 270 ms 27692 KB Output is correct
12 Correct 255 ms 27564 KB Output is correct
13 Correct 252 ms 27584 KB Output is correct
14 Correct 255 ms 27516 KB Output is correct
15 Correct 252 ms 27688 KB Output is correct
16 Correct 257 ms 27020 KB Output is correct
17 Correct 273 ms 26944 KB Output is correct
18 Correct 256 ms 26932 KB Output is correct
19 Correct 260 ms 27564 KB Output is correct
20 Correct 104 ms 25480 KB Output is correct
21 Correct 69 ms 27712 KB Output is correct
22 Correct 65 ms 26956 KB Output is correct
23 Correct 109 ms 27212 KB Output is correct
24 Correct 108 ms 27192 KB Output is correct
25 Correct 104 ms 26484 KB Output is correct
26 Correct 106 ms 26396 KB Output is correct
27 Correct 106 ms 26448 KB Output is correct
28 Correct 108 ms 26788 KB Output is correct
29 Correct 658 ms 66388 KB Output is correct
30 Correct 553 ms 67876 KB Output is correct
31 Correct 567 ms 65932 KB Output is correct
32 Correct 661 ms 66448 KB Output is correct
33 Correct 655 ms 66576 KB Output is correct
34 Correct 652 ms 64112 KB Output is correct
35 Correct 633 ms 63904 KB Output is correct
36 Correct 645 ms 63804 KB Output is correct
37 Correct 666 ms 65256 KB Output is correct
38 Correct 529 ms 66460 KB Output is correct
39 Correct 532 ms 66564 KB Output is correct
40 Correct 512 ms 63192 KB Output is correct
41 Correct 504 ms 62572 KB Output is correct
42 Correct 532 ms 62704 KB Output is correct
43 Correct 519 ms 64312 KB Output is correct
44 Correct 568 ms 66552 KB Output is correct
45 Correct 550 ms 66548 KB Output is correct
46 Correct 539 ms 63264 KB Output is correct
47 Correct 551 ms 62960 KB Output is correct
48 Correct 528 ms 62872 KB Output is correct
49 Correct 552 ms 65084 KB Output is correct
50 Correct 588 ms 66656 KB Output is correct
51 Correct 595 ms 66548 KB Output is correct
52 Correct 596 ms 64016 KB Output is correct
53 Correct 561 ms 63840 KB Output is correct
54 Correct 595 ms 63744 KB Output is correct
55 Correct 572 ms 65412 KB Output is correct