oj.uz

답안 #260755

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
260755 2020-08-10T20:41:43 Z limabeans 3단 점프 (JOI19_jumps) C++17
100 / 100
 1281 ms 89592 KB 
#include <bits/stdc++.h>
using namespace std;

template<typename T>
void out(T x) { cout << x << endl; exit(0); }
#define watch(x) cout << (#x) << " is " << (x) << endl





const int inf = 1e9;

struct node {
    int ab,c,abc;
    node() {
	ab=c=abc=-inf;
    }
    node(int _ab, int _c, int _abc) : ab(_ab), c(_c), abc(_abc) {}
};

struct segtree {
    node merge(node x, node y) {
	return { max(x.ab,y.ab), max(x.c,y.c), max({x.abc,y.abc,x.ab+y.c}) };
	return x;
    }
    int n;
    vector<node> t;
    void init(int n) {
	n += 10;
	this->n = n;
	t.resize(n*4);
    }

    void upd(int v, int tl, int tr, int i, int val, int stat) {
	if (tl == tr) {
	    if (stat==0) {
		t[v].ab=max(t[v].ab, val);
	    } else {
		t[v].c=max(t[v].c, val);
	    }
	    t[v].abc = max(t[v].abc, t[v].ab + t[v].c);
	} else {
	    int tm = (tl+tr)/2;
	    if (i<=tm) {
		upd(2*v,tl,tm,i,val,stat);
	    } else {
		upd(2*v+1,tm+1,tr,i,val,stat);
	    }
	    t[v] = merge(t[2*v], t[2*v+1]);
	}
    }

    node qry(int v, int tl, int tr, int l, int r) {
	if (l>tr || r<tl) {
	    return node();
	}
	if (l <= tl && tr <= r) {
	    return t[v];
	}
	int tm = (tl+tr)/2;
	return merge(qry(2*v,tl,tm,l,r), qry(2*v+1,tm+1,tr,l,r));
    }
};

const int maxn = 5e5+10;



int n;
int A[maxn];
vector<int> B[maxn];

int q;
int ans[maxn];
vector<pair<int,int>> Q[maxn]; //(r,i)
segtree tree;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);  cout.tie(0);
    cin>>n;
    tree.init(n+10);
    
    for (int i=1; i<=n; i++) {
	cin>>A[i];
	tree.upd(1,1,n,i,A[i],1);
    }
    

    cin>>q;
    for (int i=0; i<q; i++) {
	int l,r;
	cin>>l>>r;
	Q[l].push_back({r,i});
    }


    stack<int> stk;
    for (int i=1; i<=n; i++) {
	while (!stk.empty() && A[stk.top()] <= A[i]) {
	    B[stk.top()].push_back(i);
	    stk.pop();
	}
	if (!stk.empty()) {
	    B[stk.top()].push_back(i);
	}
	stk.push(i);
    }
    while (!stk.empty()) stk.pop();

    for (int i=n; i>=1; i--) {
	while (!stk.empty() && A[stk.top()] >= A[i]) {
	    B[i].push_back(stk.top());
	    stk.pop();
	}
	stk.push(i);
    }

    for (int a=n; a>=1; a--) {
	for (int b: B[a]) {
	    int c = b+(b-a);
	    if (c <= n) {
		tree.upd(1,1,n,c,A[a]+A[b],0);
	    }
	}
	for (auto qq: Q[a]) {
	    int idx = qq.second;
	    int r = qq.first;

	    ans[idx] = tree.qry(1,1,n,a,r).abc;
	}
    }

    for (int i=0; i<q; i++) {
	cout<<ans[i]<<"\n";
    }
    
    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23808 KB Output is correct
2 Correct 14 ms 23808 KB Output is correct
3 Correct 14 ms 23808 KB Output is correct
4 Correct 15 ms 23808 KB Output is correct
5 Correct 14 ms 23808 KB Output is correct
6 Correct 14 ms 23808 KB Output is correct
7 Correct 14 ms 23808 KB Output is correct
8 Correct 15 ms 23808 KB Output is correct
9 Correct 14 ms 23936 KB Output is correct
10 Correct 14 ms 23808 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23808 KB Output is correct
2 Correct 14 ms 23808 KB Output is correct
3 Correct 14 ms 23808 KB Output is correct
4 Correct 15 ms 23808 KB Output is correct
5 Correct 14 ms 23808 KB Output is correct
6 Correct 14 ms 23808 KB Output is correct
7 Correct 14 ms 23808 KB Output is correct
8 Correct 15 ms 23808 KB Output is correct
9 Correct 14 ms 23936 KB Output is correct
10 Correct 14 ms 23808 KB Output is correct
11 Correct 396 ms 37752 KB Output is correct
12 Correct 358 ms 37372 KB Output is correct
13 Correct 356 ms 37484 KB Output is correct
14 Correct 363 ms 37496 KB Output is correct
15 Correct 362 ms 37464 KB Output is correct
16 Correct 359 ms 36856 KB Output is correct
17 Correct 364 ms 36856 KB Output is correct
18 Correct 383 ms 36728 KB Output is correct
19 Correct 368 ms 37496 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 203 ms 41072 KB Output is correct
2 Correct 163 ms 40312 KB Output is correct
3 Correct 121 ms 41080 KB Output is correct
4 Correct 219 ms 41148 KB Output is correct
5 Correct 208 ms 41080 KB Output is correct
6 Correct 194 ms 41080 KB Output is correct
7 Correct 195 ms 41096 KB Output is correct
8 Correct 194 ms 41208 KB Output is correct
9 Correct 203 ms 41080 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23808 KB Output is correct
2 Correct 14 ms 23808 KB Output is correct
3 Correct 14 ms 23808 KB Output is correct
4 Correct 15 ms 23808 KB Output is correct
5 Correct 14 ms 23808 KB Output is correct
6 Correct 14 ms 23808 KB Output is correct
7 Correct 14 ms 23808 KB Output is correct
8 Correct 15 ms 23808 KB Output is correct
9 Correct 14 ms 23936 KB Output is correct
10 Correct 14 ms 23808 KB Output is correct
11 Correct 396 ms 37752 KB Output is correct
12 Correct 358 ms 37372 KB Output is correct
13 Correct 356 ms 37484 KB Output is correct
14 Correct 363 ms 37496 KB Output is correct
15 Correct 362 ms 37464 KB Output is correct
16 Correct 359 ms 36856 KB Output is correct
17 Correct 364 ms 36856 KB Output is correct
18 Correct 383 ms 36728 KB Output is correct
19 Correct 368 ms 37496 KB Output is correct
20 Correct 203 ms 41072 KB Output is correct
21 Correct 163 ms 40312 KB Output is correct
22 Correct 121 ms 41080 KB Output is correct
23 Correct 219 ms 41148 KB Output is correct
24 Correct 208 ms 41080 KB Output is correct
25 Correct 194 ms 41080 KB Output is correct
26 Correct 195 ms 41096 KB Output is correct
27 Correct 194 ms 41208 KB Output is correct
28 Correct 203 ms 41080 KB Output is correct
29 Correct 1210 ms 83916 KB Output is correct
30 Correct 1080 ms 81912 KB Output is correct
31 Correct 1004 ms 83836 KB Output is correct
32 Correct 1271 ms 83868 KB Output is correct
33 Correct 1281 ms 84100 KB Output is correct
34 Correct 1207 ms 83448 KB Output is correct
35 Correct 1242 ms 83380 KB Output is correct
36 Correct 1213 ms 83172 KB Output is correct
37 Correct 1249 ms 83832 KB Output is correct
38 Correct 952 ms 89528 KB Output is correct
39 Correct 947 ms 89592 KB Output is correct
40 Correct 917 ms 87928 KB Output is correct
41 Correct 953 ms 87672 KB Output is correct
42 Correct 996 ms 87672 KB Output is correct
43 Correct 997 ms 88444 KB Output is correct
44 Correct 1006 ms 88976 KB Output is correct
45 Correct 993 ms 89208 KB Output is correct
46 Correct 965 ms 87544 KB Output is correct
47 Correct 956 ms 87400 KB Output is correct
48 Correct 978 ms 87544 KB Output is correct
49 Correct 1008 ms 88568 KB Output is correct
50 Correct 1091 ms 86776 KB Output is correct
51 Correct 1062 ms 86788 KB Output is correct
52 Correct 1070 ms 86008 KB Output is correct
53 Correct 1078 ms 86008 KB Output is correct
54 Correct 1062 ms 85900 KB Output is correct
55 Correct 1064 ms 86776 KB Output is correct