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답안 #367745

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
367745 2021-02-18T08:47:19 Z BartolM 3단 점프 (JOI19_jumps) C++17
100 / 100
 1425 ms 87788 KB 
#include <bits/stdc++.h>

using namespace std;

#define X first
#define Y second
#define mp make_pair
#define pb push_back
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <int, pii> pip;
typedef pair <pii, int> ppi;
typedef pair <ll, ll> pll;

const int INF=0x3f3f3f3f;
const int N=5e5+5;
const int OFF=(1<<19);

struct Node{
    int ab, c, res;
    Node (int ab_=-INF, int c_=-INF, int res_=-INF) {
        ab=ab_; c=c_; res=res_;
    }
};

int n, q;
int p[N], sol[N];
vector <pii> que[N];
vector <int> v[N];
vector <int> st;
Node T[2*OFF];
#define DEBUG 0

Node mrg(Node a, Node b) {
    Node ret=Node(max(a.ab, b.ab), max(a.c, b.c), max(a.res, b.res));
    ret.res=max(ret.res, a.ab+b.c);
    return ret;
}

void update(int pos, int val, int fl) {
    if (pos>=n) return;

    pos+=OFF;
    if (fl) T[pos].ab=max(T[pos].ab, val);
    else T[pos].c=max(T[pos].c, val);
    T[pos].res=max(T[pos].res, T[pos].ab+T[pos].c);

    pos/=2;
    while (pos) {
        T[pos]=mrg(T[pos*2], T[pos*2+1]);
        pos/=2;
    }
}

Node query(int a, int b, int pos=1, int lo=0, int hi=OFF) {
    if (lo>=a && hi<=b) return T[pos];
    if (lo>=b || hi<=a) return Node();
    int mid=(lo+hi)/2;
    return mrg(query(a, b, pos*2, lo, mid), query(a, b, pos*2+1, mid, hi));
}

void solve() {
    for (int i=0; i<n; ++i) {
        while (st.size() && p[st.back()]<=p[i]) {
            v[st.back()].pb(i);
            st.pop_back();
        }
        if (st.size()) v[st.back()].pb(i);
        st.pb(i);
    }
    #if DEBUG
        for (int i=0; i<n; ++i) {
            for (int r:v[i]) printf("[%d, %d]\n", i, r);
        }
    #endif // DEBUG
    for (int i=n-1; i>=0; --i) {
        update(i, p[i], 0);
        for (int r:v[i]) update(2*r-i, p[i]+p[r], 1);
        for (pii pp:que[i]) sol[pp.Y]=query(i, pp.X+1).res;
    }
    for (int i=0; i<q; ++i) printf("%d\n", sol[i]);
}

void load() {
    scanf("%d", &n);
    for (int i=0; i<n; ++i) scanf("%d", &p[i]);
    scanf("%d", &q);
    for (int i=0; i<q; ++i) {
        int l, r;
        scanf("%d %d", &l, &r); l--; r--;
        que[l].pb(mp(r, i));
    }
}

int main() {
    load();
    solve();
    return 0;
}

Compilation message

jumps.cpp: In function 'void load()':
jumps.cpp:85:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   85 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
jumps.cpp:86:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   86 |     for (int i=0; i<n; ++i) scanf("%d", &p[i]);
      |                             ~~~~~^~~~~~~~~~~~~
jumps.cpp:87:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   87 |     scanf("%d", &q);
      |     ~~~~~^~~~~~~~~~
jumps.cpp:90:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   90 |         scanf("%d %d", &l, &r); l--; r--;
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 36076 KB Output is correct
2 Correct 25 ms 36076 KB Output is correct
3 Correct 25 ms 36076 KB Output is correct
4 Correct 24 ms 36076 KB Output is correct
5 Correct 25 ms 36076 KB Output is correct
6 Correct 25 ms 36076 KB Output is correct
7 Correct 24 ms 36076 KB Output is correct
8 Correct 25 ms 36076 KB Output is correct
9 Correct 25 ms 36332 KB Output is correct
10 Correct 24 ms 36076 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 36076 KB Output is correct
2 Correct 25 ms 36076 KB Output is correct
3 Correct 25 ms 36076 KB Output is correct
4 Correct 24 ms 36076 KB Output is correct
5 Correct 25 ms 36076 KB Output is correct
6 Correct 25 ms 36076 KB Output is correct
7 Correct 24 ms 36076 KB Output is correct
8 Correct 25 ms 36076 KB Output is correct
9 Correct 25 ms 36332 KB Output is correct
10 Correct 24 ms 36076 KB Output is correct
11 Correct 528 ms 54784 KB Output is correct
12 Correct 519 ms 54764 KB Output is correct
13 Correct 522 ms 54892 KB Output is correct
14 Correct 542 ms 54764 KB Output is correct
15 Correct 523 ms 54892 KB Output is correct
16 Correct 531 ms 54124 KB Output is correct
17 Correct 536 ms 54056 KB Output is correct
18 Correct 518 ms 54124 KB Output is correct
19 Correct 515 ms 54636 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 244 ms 45164 KB Output is correct
2 Correct 172 ms 44908 KB Output is correct
3 Correct 175 ms 45792 KB Output is correct
4 Correct 240 ms 45164 KB Output is correct
5 Correct 241 ms 45292 KB Output is correct
6 Correct 236 ms 44652 KB Output is correct
7 Correct 241 ms 44396 KB Output is correct
8 Correct 234 ms 44524 KB Output is correct
9 Correct 239 ms 44908 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 36076 KB Output is correct
2 Correct 25 ms 36076 KB Output is correct
3 Correct 25 ms 36076 KB Output is correct
4 Correct 24 ms 36076 KB Output is correct
5 Correct 25 ms 36076 KB Output is correct
6 Correct 25 ms 36076 KB Output is correct
7 Correct 24 ms 36076 KB Output is correct
8 Correct 25 ms 36076 KB Output is correct
9 Correct 25 ms 36332 KB Output is correct
10 Correct 24 ms 36076 KB Output is correct
11 Correct 528 ms 54784 KB Output is correct
12 Correct 519 ms 54764 KB Output is correct
13 Correct 522 ms 54892 KB Output is correct
14 Correct 542 ms 54764 KB Output is correct
15 Correct 523 ms 54892 KB Output is correct
16 Correct 531 ms 54124 KB Output is correct
17 Correct 536 ms 54056 KB Output is correct
18 Correct 518 ms 54124 KB Output is correct
19 Correct 515 ms 54636 KB Output is correct
20 Correct 244 ms 45164 KB Output is correct
21 Correct 172 ms 44908 KB Output is correct
22 Correct 175 ms 45792 KB Output is correct
23 Correct 240 ms 45164 KB Output is correct
24 Correct 241 ms 45292 KB Output is correct
25 Correct 236 ms 44652 KB Output is correct
26 Correct 241 ms 44396 KB Output is correct
27 Correct 234 ms 44524 KB Output is correct
28 Correct 239 ms 44908 KB Output is correct
29 Correct 1381 ms 82284 KB Output is correct
30 Correct 1220 ms 81572 KB Output is correct
31 Correct 1213 ms 83608 KB Output is correct
32 Correct 1418 ms 82176 KB Output is correct
33 Correct 1406 ms 82204 KB Output is correct
34 Correct 1419 ms 79808 KB Output is correct
35 Correct 1425 ms 79540 KB Output is correct
36 Correct 1418 ms 79724 KB Output is correct
37 Correct 1378 ms 81004 KB Output is correct
38 Correct 1075 ms 87788 KB Output is correct
39 Correct 1066 ms 87788 KB Output is correct
40 Correct 1058 ms 84796 KB Output is correct
41 Correct 1045 ms 83948 KB Output is correct
42 Correct 1064 ms 83980 KB Output is correct
43 Correct 1059 ms 85692 KB Output is correct
44 Correct 1114 ms 87436 KB Output is correct
45 Correct 1125 ms 87368 KB Output is correct
46 Correct 1107 ms 84204 KB Output is correct
47 Correct 1107 ms 83864 KB Output is correct
48 Correct 1107 ms 83816 KB Output is correct
49 Correct 1112 ms 85996 KB Output is correct
50 Correct 1195 ms 85144 KB Output is correct
51 Correct 1202 ms 85168 KB Output is correct
52 Correct 1177 ms 82672 KB Output is correct
53 Correct 1184 ms 82428 KB Output is correct
54 Correct 1182 ms 82292 KB Output is correct
55 Correct 1187 ms 84008 KB Output is correct