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Submission #486955

# Submission time Handle Problem Language Result Execution time Memory
486955 2021-11-13T14:24:19 Z KienTran Feast (NOI19_feast) C++14
100 / 100
 190 ms 145288 KB 
#include <bits/stdc++.h>
#define int long long

using namespace std;

const int O = 3e5 + 5;
const int inf = 1e18;

int n, k, a[O], lazy[O * 4];

struct Node{
    int sum, l, r, w, pref, suf, lsuf, rpref;
} tree[O * 4], rtree[O * 4];

Node Merg(Node x, Node y){
    Node root; root.w = -inf;
    root.sum = x.sum + y.sum;

    root.pref = x.pref;
    root.rpref = x.rpref;
    if (x.sum + y.pref > root.pref){
        root.pref = x.sum + y.pref;
        root.rpref = y.rpref;
    }

    root.suf = y.suf;
    root.lsuf = y.lsuf;
    if (y.sum + x.suf > root.suf){
        root.suf = y.sum + x.suf;
        root.lsuf = x.lsuf;
    }

    if (x.w > root.w){
        root.w = x.w;
        root.l = x.l;
        root.r = x.r;
    }

    if (y.w > root.w){
        root.w = y.w;
        root.l = y.l;
        root.r = y.r;
    }

    if (x.suf + y.pref >= root.w){
        root.w = x.suf + y.pref;
        root.l = x.lsuf;
        root.r = y.rpref;
    }

    return root;
}

void Push(int id){
    int &x = lazy[id];
    if (x == 0) return;

    for (int i = 2 * id; i <= 2 * id + 1; ++ i){
        swap(tree[i], rtree[i]);
        lazy[i] ^= x;
    }

    x = 0; return;
}

void Build(int id, int l, int r){
    if (l == r){
        tree[id] = {a[l], r, l, a[r], a[l], a[r], l, r};
        rtree[id] = {-a[r], l, r, -a[l], -a[r], -a[l], r, l};
        return;
    }
    int mid = (l + r) / 2;
    Build(id << 1, l, mid);
    Build(id << 1 | 1, mid + 1, r);
    tree[id] = Merg(tree[id << 1], tree[id << 1 | 1]);
    rtree[id] = Merg(rtree[id << 1], rtree[id << 1 | 1]);
}

void Update(int id, int l, int r, int u, int v){
    if (l > v || r < u) return;
    if (u <= l && r <= v){
        swap(tree[id], rtree[id]);
        lazy[id] ^= 1;
        return;
    }
    int mid = (l + r) / 2; Push(id);
    Update(id << 1, l, mid, u, v);
    Update(id << 1 | 1, mid + 1, r, u, v);
    tree[id] = Merg(tree[id << 1], tree[id << 1 | 1]);
    rtree[id] = Merg(rtree[id << 1], rtree[id << 1 | 1]);
}

main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    cin >> n >> k;
    for (int i = 1; i <= n; ++ i) cin >> a[i];

    Build(1, 1, n);

    int res = 0;
    for (int i = 1; i <= k; ++ i){
        if (tree[1].w <= 0) break;
        res += tree[1].w;
        Update(1, 1, n, tree[1].l, tree[1].r);
    }

    cout << res;
    return 0;
}

Compilation message

feast.cpp:93:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   93 | main(){
      | ^~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 78 ms 133928 KB Output is correct
2 Correct 80 ms 133884 KB Output is correct
3 Correct 81 ms 133916 KB Output is correct
4 Correct 80 ms 133956 KB Output is correct
5 Correct 85 ms 133972 KB Output is correct
6 Correct 83 ms 133808 KB Output is correct
7 Correct 89 ms 133936 KB Output is correct
8 Correct 81 ms 133880 KB Output is correct
9 Correct 80 ms 133844 KB Output is correct
10 Correct 81 ms 133956 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 133976 KB Output is correct
2 Correct 73 ms 133964 KB Output is correct
3 Correct 71 ms 135060 KB Output is correct
4 Correct 72 ms 135136 KB Output is correct
5 Correct 82 ms 136616 KB Output is correct
6 Correct 71 ms 135068 KB Output is correct
7 Correct 72 ms 135152 KB Output is correct
8 Correct 82 ms 136908 KB Output is correct
9 Correct 85 ms 136688 KB Output is correct
10 Correct 73 ms 135108 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 133956 KB Output is correct
2 Correct 88 ms 136912 KB Output is correct
3 Correct 93 ms 136988 KB Output is correct
4 Correct 95 ms 136912 KB Output is correct
5 Correct 84 ms 136944 KB Output is correct
6 Correct 87 ms 137096 KB Output is correct
7 Correct 87 ms 137104 KB Output is correct
8 Correct 86 ms 136900 KB Output is correct
9 Correct 86 ms 137028 KB Output is correct
10 Correct 89 ms 137068 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct

Subtask #5
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 0 ms 460 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 0 ms 460 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 0 ms 332 KB Output is correct
17 Correct 0 ms 460 KB Output is correct
18 Correct 1 ms 460 KB Output is correct
19 Correct 1 ms 460 KB Output is correct
20 Correct 0 ms 460 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 332 KB Output is correct
11 Correct 0 ms 460 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 0 ms 460 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 0 ms 332 KB Output is correct
17 Correct 0 ms 460 KB Output is correct
18 Correct 1 ms 460 KB Output is correct
19 Correct 1 ms 460 KB Output is correct
20 Correct 0 ms 460 KB Output is correct
21 Correct 1 ms 844 KB Output is correct
22 Correct 1 ms 852 KB Output is correct
23 Correct 1 ms 844 KB Output is correct
24 Correct 1 ms 844 KB Output is correct
25 Correct 1 ms 844 KB Output is correct
26 Correct 1 ms 844 KB Output is correct
27 Correct 1 ms 844 KB Output is correct
28 Correct 1 ms 844 KB Output is correct
29 Correct 1 ms 844 KB Output is correct
30 Correct 1 ms 844 KB Output is correct

Subtask #7
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 78 ms 133928 KB Output is correct
2 Correct 80 ms 133884 KB Output is correct
3 Correct 81 ms 133916 KB Output is correct
4 Correct 80 ms 133956 KB Output is correct
5 Correct 85 ms 133972 KB Output is correct
6 Correct 83 ms 133808 KB Output is correct
7 Correct 89 ms 133936 KB Output is correct
8 Correct 81 ms 133880 KB Output is correct
9 Correct 80 ms 133844 KB Output is correct
10 Correct 81 ms 133956 KB Output is correct
11 Correct 71 ms 133976 KB Output is correct
12 Correct 73 ms 133964 KB Output is correct
13 Correct 71 ms 135060 KB Output is correct
14 Correct 72 ms 135136 KB Output is correct
15 Correct 82 ms 136616 KB Output is correct
16 Correct 71 ms 135068 KB Output is correct
17 Correct 72 ms 135152 KB Output is correct
18 Correct 82 ms 136908 KB Output is correct
19 Correct 85 ms 136688 KB Output is correct
20 Correct 73 ms 135108 KB Output is correct
21 Correct 86 ms 133956 KB Output is correct
22 Correct 88 ms 136912 KB Output is correct
23 Correct 93 ms 136988 KB Output is correct
24 Correct 95 ms 136912 KB Output is correct
25 Correct 84 ms 136944 KB Output is correct
26 Correct 87 ms 137096 KB Output is correct
27 Correct 87 ms 137104 KB Output is correct
28 Correct 86 ms 136900 KB Output is correct
29 Correct 86 ms 137028 KB Output is correct
30 Correct 89 ms 137068 KB Output is correct
31 Correct 0 ms 332 KB Output is correct
32 Correct 0 ms 332 KB Output is correct
33 Correct 0 ms 332 KB Output is correct
34 Correct 1 ms 320 KB Output is correct
35 Correct 0 ms 332 KB Output is correct
36 Correct 0 ms 332 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 0 ms 332 KB Output is correct
39 Correct 1 ms 332 KB Output is correct
40 Correct 0 ms 332 KB Output is correct
41 Correct 0 ms 460 KB Output is correct
42 Correct 1 ms 332 KB Output is correct
43 Correct 1 ms 460 KB Output is correct
44 Correct 0 ms 460 KB Output is correct
45 Correct 1 ms 460 KB Output is correct
46 Correct 0 ms 332 KB Output is correct
47 Correct 0 ms 460 KB Output is correct
48 Correct 1 ms 460 KB Output is correct
49 Correct 1 ms 460 KB Output is correct
50 Correct 0 ms 460 KB Output is correct
51 Correct 1 ms 844 KB Output is correct
52 Correct 1 ms 852 KB Output is correct
53 Correct 1 ms 844 KB Output is correct
54 Correct 1 ms 844 KB Output is correct
55 Correct 1 ms 844 KB Output is correct
56 Correct 1 ms 844 KB Output is correct
57 Correct 1 ms 844 KB Output is correct
58 Correct 1 ms 844 KB Output is correct
59 Correct 1 ms 844 KB Output is correct
60 Correct 1 ms 844 KB Output is correct
61 Correct 162 ms 145040 KB Output is correct
62 Correct 190 ms 145288 KB Output is correct
63 Correct 101 ms 143636 KB Output is correct
64 Correct 157 ms 145096 KB Output is correct
65 Correct 138 ms 145204 KB Output is correct
66 Correct 141 ms 145080 KB Output is correct
67 Correct 133 ms 145096 KB Output is correct
68 Correct 91 ms 140100 KB Output is correct
69 Correct 93 ms 138836 KB Output is correct
70 Correct 93 ms 136972 KB Output is correct