oj.uz

Submission #257586

# Submission time Handle Problem Language Result Execution time Memory
257586 2020-08-04T12:38:10 Z BThero Bigger segments (IZhO19_segments) C++17
100 / 100
 1210 ms 50424 KB 
// chrono::system_clock::now().time_since_epoch().count()
#include<bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define debug(x) cerr << #x << " = " << x << endl;

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int MAXN = (int)5e5 + 5;
const ll INF = (ll)1e16;

mt19937 rnd(chrono::system_clock::now().time_since_epoch().count());

struct Node {
  Node *L, *R;
  int y;
  ll x;
  pii val, mx;
  
  Node() {
    L = R = NULL;
    x = 0;
    y = rnd();
    val = mx = mp(0, 0);
  }
  
  Node(ll x, pii val) : x(x), val(val), mx(val) {
    L = R = NULL;
    y = rnd();
  }
} *T;

void show(Node *&v) {
  if (!v) {
    return;
  }
  
  if (v -> L) {
    show(v -> L);
  }

  printf("(%lld - %d %d) ", v -> x, v -> mx.fi, v -> mx.se);
  
  if (v -> R) {
    show(v -> R);
  }
}

void showln(Node *&v) {
  show(v);
  printf("\n");
}

void recalc(Node *&v) {
  if (!v) {
    return;
  }
  
  v -> mx = v -> val;
  
  if (v -> L) {
    v -> mx = max(v -> mx, v -> L -> mx);
  }
  
  if (v -> R) {
    v -> mx = max(v -> mx, v -> R -> mx);
  }
}

void Merge(Node *&T, Node *L, Node *R) {
  recalc(L);
  recalc(R);

  if (!L) {
    T = R;
    recalc(T);
    return;
  }
  
  if (!R) {
    T = L;
    recalc(T);
    return;
  }
  
  if (L -> y > R -> y) {
    T = L;
    Merge(T -> R, T -> R, R);
  }
  else {
    T = R;
    Merge(T -> L, L, T -> L);
  }
  
  recalc(T);
}

void Split(Node *T, Node *&L, Node *&R, ll x) {
  recalc(T);

  if (!T) {
    L = R = NULL;
    return;
  }
  
  if (T -> x < x) {
    Split(T -> R, T -> R, R, x);
    L = T;
  }
  else {
    Split(T -> L, L, T -> L, x);
    R = T;
  }
  
  recalc(L);
  recalc(R);
}

void addEl(ll x, pii val) {
  //printf("ADD %lld - (%d %d)\n", x, val.fi, val.se);

  Node *L, *R, *M;
  L = R = M = NULL;
  
  Split(T, L, R, x);
  Split(R, M, R, x + 1);
  
  if (!M) {
    M = new Node(x, val);
  }
  else {
    M -> val = max(M -> val, val);
    recalc(M);
  }
  
  Merge(T, L, M);
  Merge(T, T, R);
}

pii prefMax(ll x) {
  Node *L, *R;
  L = R = NULL;
  Split(T, L, R, x + 1);
  pii ret = L -> mx;
  Merge(T, L, R);
  return ret;
}

pair<int, ll> dp[MAXN];
ll pref[MAXN];
int arr[MAXN];
int n;

void solve() {
  scanf("%d", &n);
  
  for (int i = 1; i <= n; ++i) {
    scanf("%d", &arr[i]);
    pref[i] = pref[i - 1] + arr[i];
  }
  
  for (int i = 1; i <= n; ++i) {
    dp[i] = mp(0, INF);
  }
  
  dp[0] = mp(0, 0);
  addEl(0, mp(0, 0));
  
  for (int i = 1; i <= n; ++i) {
    dp[i] = prefMax(pref[i]);
    dp[i].fi++;
    dp[i].se = pref[i] - pref[dp[i].se];
    addEl(dp[i].se + pref[i], mp(dp[i].fi, i));
  }
  
  printf("%d\n", dp[n].fi);
}

int main() {
  int tt = 1;
  
  while (tt--) {
    solve();
  }

  return 0;
}

Compilation message

segments.cpp: In function 'void solve()':
segments.cpp:163:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
   ~~~~~^~~~~~~~~~
segments.cpp:166:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &arr[i]);
     ~~~~~^~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 384 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 384 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 384 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 4 ms 640 KB Output is correct
32 Correct 5 ms 672 KB Output is correct
33 Correct 5 ms 640 KB Output is correct
34 Correct 5 ms 640 KB Output is correct
35 Correct 3 ms 640 KB Output is correct
36 Correct 5 ms 640 KB Output is correct
37 Correct 5 ms 640 KB Output is correct
38 Correct 5 ms 512 KB Output is correct
39 Correct 5 ms 640 KB Output is correct
40 Correct 5 ms 640 KB Output is correct
41 Correct 3 ms 640 KB Output is correct
42 Correct 3 ms 640 KB Output is correct
43 Correct 5 ms 640 KB Output is correct
44 Correct 3 ms 640 KB Output is correct
45 Correct 3 ms 640 KB Output is correct

Subtask #4
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 384 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 4 ms 640 KB Output is correct
32 Correct 5 ms 672 KB Output is correct
33 Correct 5 ms 640 KB Output is correct
34 Correct 5 ms 640 KB Output is correct
35 Correct 3 ms 640 KB Output is correct
36 Correct 5 ms 640 KB Output is correct
37 Correct 5 ms 640 KB Output is correct
38 Correct 5 ms 512 KB Output is correct
39 Correct 5 ms 640 KB Output is correct
40 Correct 5 ms 640 KB Output is correct
41 Correct 3 ms 640 KB Output is correct
42 Correct 3 ms 640 KB Output is correct
43 Correct 5 ms 640 KB Output is correct
44 Correct 3 ms 640 KB Output is correct
45 Correct 3 ms 640 KB Output is correct
46 Correct 91 ms 9728 KB Output is correct
47 Correct 212 ms 9848 KB Output is correct
48 Correct 180 ms 9848 KB Output is correct
49 Correct 169 ms 9848 KB Output is correct
50 Correct 93 ms 9720 KB Output is correct
51 Correct 202 ms 9772 KB Output is correct
52 Correct 106 ms 5372 KB Output is correct
53 Correct 54 ms 3320 KB Output is correct
54 Correct 206 ms 9080 KB Output is correct
55 Correct 180 ms 9720 KB Output is correct
56 Correct 91 ms 9848 KB Output is correct
57 Correct 126 ms 9848 KB Output is correct
58 Correct 129 ms 9464 KB Output is correct
59 Correct 105 ms 9852 KB Output is correct
60 Correct 146 ms 9936 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 384 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 4 ms 640 KB Output is correct
32 Correct 5 ms 672 KB Output is correct
33 Correct 5 ms 640 KB Output is correct
34 Correct 5 ms 640 KB Output is correct
35 Correct 3 ms 640 KB Output is correct
36 Correct 5 ms 640 KB Output is correct
37 Correct 5 ms 640 KB Output is correct
38 Correct 5 ms 512 KB Output is correct
39 Correct 5 ms 640 KB Output is correct
40 Correct 5 ms 640 KB Output is correct
41 Correct 3 ms 640 KB Output is correct
42 Correct 3 ms 640 KB Output is correct
43 Correct 5 ms 640 KB Output is correct
44 Correct 3 ms 640 KB Output is correct
45 Correct 3 ms 640 KB Output is correct
46 Correct 91 ms 9728 KB Output is correct
47 Correct 212 ms 9848 KB Output is correct
48 Correct 180 ms 9848 KB Output is correct
49 Correct 169 ms 9848 KB Output is correct
50 Correct 93 ms 9720 KB Output is correct
51 Correct 202 ms 9772 KB Output is correct
52 Correct 106 ms 5372 KB Output is correct
53 Correct 54 ms 3320 KB Output is correct
54 Correct 206 ms 9080 KB Output is correct
55 Correct 180 ms 9720 KB Output is correct
56 Correct 91 ms 9848 KB Output is correct
57 Correct 126 ms 9848 KB Output is correct
58 Correct 129 ms 9464 KB Output is correct
59 Correct 105 ms 9852 KB Output is correct
60 Correct 146 ms 9936 KB Output is correct
61 Correct 621 ms 46188 KB Output is correct
62 Correct 880 ms 45816 KB Output is correct
63 Correct 1210 ms 45816 KB Output is correct
64 Correct 1067 ms 49908 KB Output is correct
65 Correct 524 ms 50168 KB Output is correct
66 Correct 1118 ms 50424 KB Output is correct
67 Correct 823 ms 40240 KB Output is correct
68 Correct 418 ms 20344 KB Output is correct
69 Correct 1081 ms 44408 KB Output is correct
70 Correct 950 ms 50296 KB Output is correct
71 Correct 516 ms 47224 KB Output is correct
72 Correct 678 ms 47728 KB Output is correct
73 Correct 645 ms 48376 KB Output is correct
74 Correct 494 ms 48636 KB Output is correct
75 Correct 583 ms 48632 KB Output is correct