oj.uz

Submission #867874

# Submission time Handle Problem Language Result Execution time Memory
867874 2023-10-29T16:24:54 Z nnhzzz Bigger segments (IZhO19_segments) C++14
100 / 100
 66 ms 22356 KB 
// cre: Nguyen Ngoc Hung - Train VOI 2024 :>

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <unordered_set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
#include <cstring>
#include <unordered_map>
#include <cmath>
#include <array>
#include <cassert>
#include <random>

using namespace std;

#define        __nnhzzz__  signed main()
#define          BIT(i,j)  ((i>>j)&1LL)
#define           MASK(i)  (1LL<<i)
#define            ALL(x)  (x).begin(),(x).end()
#define             SZ(x)  (int)(x).size()
#define                fi  first
#define                se  second
#define                ll  long long
#define                vi  vector<int>
#define               vvi  vector<vi>
#define               pii  pair<int,int>
#define              vpii  vector<pii>
#define REPDIS(i,be,en,j)  for(int i = (be); i<=(en); i+=j)
#define     REPD(i,be,en)  for(int i = (be); i>=(en); i--)
#define      REP(i,be,en)  for(int i = (be); i<=(en); i++)
#define               int  ll
//-------------------------------------------------------------//
const int oo = 1e9,LOG = 20,MAXN = 5e5+7,N = 1e2+3;
const int MOD = 1e9+7,MOD1 = 1e9+207,MOD2 = 1e9+407,MOD3 = 998244353;
//-------------------------------------------------------------//
template<typename T1, typename T2> bool mini(T1 &a, T2 b){if(a>b){a=b;return true;}return false;}
template<typename T1, typename T2> bool maxi(T1 &a, T2 b){if(a<b){a=b;return true;}return false;}
template<typename T> T gcd(T a, T b) { while(b) { a %= b; swap(a,b); } return a; }
template<typename T> T lcm(T a, T b) { return a/gcd(a,b)*b; }

/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Nguyen Ngoc Hung - nnhzzz
    Training for VOI24 gold medal
----------------------------------------------------------------
*/

int a[MAXN],pre[MAXN],dp[MAXN],lst[MAXN],par[MAXN];
int n;

void sub3(){
    REP(i,1,n){
        dp[i] = 1;
        lst[i] = pre[i];
        REP(j,1,i){
            int now = pre[i]-pre[j-1];
            if(lst[j-1]<=now && maxi(dp[i],dp[j-1]+1)){
                lst[i] = now;
            }else{
                if(lst[j-1]<=now && dp[i]==dp[j-1]+1) mini(lst[i],now);
            }
        }
        // cerr << dp[i] << " ";
    }
    cout << *max_element(dp,dp+n+1);
}

void sub5(){
    REP(i,1,n){
        dp[i] = 1; // lst[i] = pre[i];
        int &x = par[i]; maxi(x,par[i-1]);
        // cerr << x << " ";
        dp[i] = dp[x]+1;
        int pos = lower_bound(pre,pre+n+1,pre[i]*2-pre[x])-pre;
        maxi(par[pos],i);
    }
    cout << dp[n];
}

void solve(){
    cin >> n;
    REP(i,1,n){
        cin >> a[i];
        pre[i] = pre[i-1]+a[i];
    }
    // sub5(); return ;
    if(n<=3000){
        sub3(); return ;
    }
    sub5();
}

__nnhzzz__{
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define name "test"
    if(fopen(name".inp","r")){
        freopen(name".inp","r",stdin);
        freopen(name".out","w",stdout);
    }
    #define name1 "nnhzzz"
    if(fopen(name1".inp","r")){
        freopen(name1".inp","r",stdin);
        freopen(name1".out","w",stdout);
    }

    int test = 1;

    while(test--){
      solve();
    }
    cerr << "\nTime elapsed: " << 1000*clock()/CLOCKS_PER_SEC << "ms\n";
    return 0;
}

Compilation message

segments.cpp: In function 'int main()':
segments.cpp:129:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  129 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
segments.cpp:130:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  130 |         freopen(name".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:134:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |         freopen(name1".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:135:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  135 |         freopen(name1".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6744 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6744 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6488 KB Output is correct
19 Correct 1 ms 6492 KB Output is correct
20 Correct 1 ms 6624 KB Output is correct
21 Correct 1 ms 6492 KB Output is correct
22 Correct 1 ms 6492 KB Output is correct
23 Correct 1 ms 6492 KB Output is correct
24 Correct 2 ms 6488 KB Output is correct
25 Correct 2 ms 6492 KB Output is correct
26 Correct 1 ms 6492 KB Output is correct
27 Correct 1 ms 6488 KB Output is correct
28 Correct 1 ms 6488 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6744 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6488 KB Output is correct
19 Correct 1 ms 6492 KB Output is correct
20 Correct 1 ms 6624 KB Output is correct
21 Correct 1 ms 6492 KB Output is correct
22 Correct 1 ms 6492 KB Output is correct
23 Correct 1 ms 6492 KB Output is correct
24 Correct 2 ms 6488 KB Output is correct
25 Correct 2 ms 6492 KB Output is correct
26 Correct 1 ms 6492 KB Output is correct
27 Correct 1 ms 6488 KB Output is correct
28 Correct 1 ms 6488 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct
31 Correct 4 ms 6488 KB Output is correct
32 Correct 7 ms 6492 KB Output is correct
33 Correct 12 ms 6492 KB Output is correct
34 Correct 5 ms 6492 KB Output is correct
35 Correct 5 ms 6608 KB Output is correct
36 Correct 9 ms 6492 KB Output is correct
37 Correct 7 ms 6492 KB Output is correct
38 Correct 5 ms 6488 KB Output is correct
39 Correct 10 ms 6648 KB Output is correct
40 Correct 14 ms 6748 KB Output is correct
41 Correct 5 ms 6488 KB Output is correct
42 Correct 5 ms 6492 KB Output is correct
43 Correct 7 ms 6492 KB Output is correct
44 Correct 5 ms 6492 KB Output is correct
45 Correct 5 ms 6644 KB Output is correct

Subtask #4
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6744 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6488 KB Output is correct
19 Correct 1 ms 6492 KB Output is correct
20 Correct 1 ms 6624 KB Output is correct
21 Correct 1 ms 6492 KB Output is correct
22 Correct 1 ms 6492 KB Output is correct
23 Correct 1 ms 6492 KB Output is correct
24 Correct 2 ms 6488 KB Output is correct
25 Correct 2 ms 6492 KB Output is correct
26 Correct 1 ms 6492 KB Output is correct
27 Correct 1 ms 6488 KB Output is correct
28 Correct 1 ms 6488 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct
31 Correct 4 ms 6488 KB Output is correct
32 Correct 7 ms 6492 KB Output is correct
33 Correct 12 ms 6492 KB Output is correct
34 Correct 5 ms 6492 KB Output is correct
35 Correct 5 ms 6608 KB Output is correct
36 Correct 9 ms 6492 KB Output is correct
37 Correct 7 ms 6492 KB Output is correct
38 Correct 5 ms 6488 KB Output is correct
39 Correct 10 ms 6648 KB Output is correct
40 Correct 14 ms 6748 KB Output is correct
41 Correct 5 ms 6488 KB Output is correct
42 Correct 5 ms 6492 KB Output is correct
43 Correct 7 ms 6492 KB Output is correct
44 Correct 5 ms 6492 KB Output is correct
45 Correct 5 ms 6644 KB Output is correct
46 Correct 7 ms 9304 KB Output is correct
47 Correct 10 ms 10596 KB Output is correct
48 Correct 12 ms 10844 KB Output is correct
49 Correct 14 ms 11096 KB Output is correct
50 Correct 14 ms 11100 KB Output is correct
51 Correct 14 ms 11184 KB Output is correct
52 Correct 9 ms 5848 KB Output is correct
53 Correct 5 ms 5212 KB Output is correct
54 Correct 10 ms 10332 KB Output is correct
55 Correct 14 ms 11424 KB Output is correct
56 Correct 12 ms 10436 KB Output is correct
57 Correct 10 ms 10604 KB Output is correct
58 Correct 10 ms 10588 KB Output is correct
59 Correct 12 ms 10756 KB Output is correct
60 Correct 12 ms 10588 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6744 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6488 KB Output is correct
19 Correct 1 ms 6492 KB Output is correct
20 Correct 1 ms 6624 KB Output is correct
21 Correct 1 ms 6492 KB Output is correct
22 Correct 1 ms 6492 KB Output is correct
23 Correct 1 ms 6492 KB Output is correct
24 Correct 2 ms 6488 KB Output is correct
25 Correct 2 ms 6492 KB Output is correct
26 Correct 1 ms 6492 KB Output is correct
27 Correct 1 ms 6488 KB Output is correct
28 Correct 1 ms 6488 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct
31 Correct 4 ms 6488 KB Output is correct
32 Correct 7 ms 6492 KB Output is correct
33 Correct 12 ms 6492 KB Output is correct
34 Correct 5 ms 6492 KB Output is correct
35 Correct 5 ms 6608 KB Output is correct
36 Correct 9 ms 6492 KB Output is correct
37 Correct 7 ms 6492 KB Output is correct
38 Correct 5 ms 6488 KB Output is correct
39 Correct 10 ms 6648 KB Output is correct
40 Correct 14 ms 6748 KB Output is correct
41 Correct 5 ms 6488 KB Output is correct
42 Correct 5 ms 6492 KB Output is correct
43 Correct 7 ms 6492 KB Output is correct
44 Correct 5 ms 6492 KB Output is correct
45 Correct 5 ms 6644 KB Output is correct
46 Correct 7 ms 9304 KB Output is correct
47 Correct 10 ms 10596 KB Output is correct
48 Correct 12 ms 10844 KB Output is correct
49 Correct 14 ms 11096 KB Output is correct
50 Correct 14 ms 11100 KB Output is correct
51 Correct 14 ms 11184 KB Output is correct
52 Correct 9 ms 5848 KB Output is correct
53 Correct 5 ms 5212 KB Output is correct
54 Correct 10 ms 10332 KB Output is correct
55 Correct 14 ms 11424 KB Output is correct
56 Correct 12 ms 10436 KB Output is correct
57 Correct 10 ms 10604 KB Output is correct
58 Correct 10 ms 10588 KB Output is correct
59 Correct 12 ms 10756 KB Output is correct
60 Correct 12 ms 10588 KB Output is correct
61 Correct 39 ms 15416 KB Output is correct
62 Correct 36 ms 17488 KB Output is correct
63 Correct 47 ms 19540 KB Output is correct
64 Correct 65 ms 22068 KB Output is correct
65 Correct 66 ms 22356 KB Output is correct
66 Correct 65 ms 22280 KB Output is correct
67 Correct 53 ms 18992 KB Output is correct
68 Correct 27 ms 14928 KB Output is correct
69 Correct 48 ms 18616 KB Output is correct
70 Correct 65 ms 22352 KB Output is correct
71 Correct 51 ms 19540 KB Output is correct
72 Correct 59 ms 19740 KB Output is correct
73 Correct 52 ms 20304 KB Output is correct
74 Correct 57 ms 20804 KB Output is correct
75 Correct 57 ms 20820 KB Output is correct