Submission #467554

#	Time	Username	Problem	Language	Result	Execution time	Memory
467554		MilosMilutinovic	Exam (eJOI20_exam)	C++14	26 / 100	215 ms	2120 KiB

exam

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define FAST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);cerr.tie(0)
#define mp make_pair
#define xx first
#define yy second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define all(x) (x).begin(),(x).end()
#define inv(n) power((n), mod - 2)
#define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
#define fff(i,a,b) for (int (i) = (a); (i) <= b; (i)++)
#define bff(i,a,b) for (int (i) = (b)-1; (i) >= (a); (i)--)
#define bfff(i,a,b) for (int (i) = (b); (i) >= (a); (i)--)
#define sum_overflow(a,b) __builtin_add_overflow_p (a, b, (__typeof__ ((a) + (b))) 0)
#define mul_overflow(a,b) __builtin_mul_overflow_p (a, b, (__typeof__ ((a) + (b))) 0)

using namespace std;
long double typedef ld;
unsigned int typedef ui;
long long int typedef li;
pair<int,int> typedef pii;
pair<li,li> typedef pli;
pair<ld,ld> typedef pld;
vector<vector<int>> typedef graph;
unsigned long long int typedef ull;
//const int mod = 998244353;
const int mod = 1000000007;

using namespace __gnu_pbds;
template <class T> using oset = tree<T, null_type,less<T>, rb_tree_tag,tree_order_statistics_node_update>;
template <class T> using omset = tree<T, null_type,less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;







//Note to self: Check for overflow

int n,bans;
vector<int> a,b;
set<vector<int>> was;

int calc(vector<int> niz)
{
    int cnt=0;
    ff(i,0,n)cnt+=(niz[i]==b[i]?1:0);
    return cnt;
}

void brutuj(vector<int> niz)
{
    if (was.find(niz)!=was.end())return;
    was.insert(niz);
    bans=max(bans,calc(niz));
    ff(l,0,n)
    {
        int mx=niz[l];
        ff(r,l+1,n)
        {
            mx=max(mx,niz[r]);
            auto novi=niz;
            fff(i,l,r)novi[i]=mx;
            brutuj(novi);
        }
    }
}

int main()
{
    FAST;

    cin>>n;
    a.resize(n),b.resize(n);
    ff(i,0,n) cin>>a[i];
    ff(i,0,n) cin>>b[i];

    if(n<=10)
    {
        brutuj(a);
        cout<<bans;
        return 0;
    }

    if(*min_element(all(b))==*max_element(all(b)))
    {
        ff(i,0,n)
        {
            if(a[i]==b[i])
            {
                bff(j,0,i)
                {
                    if(a[j]>=a[i])break;
                    a[j]=a[i];
                }
                ff(j,i+1,n)
                {
                    if(a[j]>=a[i])break;
                    a[j]=a[i];
                }
            }
        }
        cout<<calc(a);
        return 0;
    }

    if(n<=5000)
    {
        vector<int> dp(n);
        bff(i,0,n)
        {
            if(i!=n-1)dp[i]=dp[i+1];
            int cnt=0;
            bfff(j,0,i)
            {
                cnt+=(a[i]==b[j]);
                dp[j]=max(dp[j],(i==n-1?0:dp[i+1])+cnt);
            }
        }
        cout<<dp[0];
        return 0;
    }

}

//Note to self: Check for overflow

Compilation message (stderr)

exam.cpp: In function 'int calc(std::vector<int>)':
exam.cpp:15:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   15 | #define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
      |                            ^
exam.cpp:53:5: note: in expansion of macro 'ff'
   53 |     ff(i,0,n)cnt+=(niz[i]==b[i]?1:0);
      |     ^~
exam.cpp: In function 'void brutuj(std::vector<int>)':
exam.cpp:15:28: warning: unnecessary parentheses in declaration of 'l' [-Wparentheses]
   15 | #define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
      |                            ^
exam.cpp:62:5: note: in expansion of macro 'ff'
   62 |     ff(l,0,n)
      |     ^~
exam.cpp:15:28: warning: unnecessary parentheses in declaration of 'r' [-Wparentheses]
   15 | #define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
      |                            ^
exam.cpp:65:9: note: in expansion of macro 'ff'
   65 |         ff(r,l+1,n)
      |         ^~
exam.cpp:16:29: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   16 | #define fff(i,a,b) for (int (i) = (a); (i) <= b; (i)++)
      |                             ^
exam.cpp:69:13: note: in expansion of macro 'fff'
   69 |             fff(i,l,r)novi[i]=mx;
      |             ^~~
exam.cpp: In function 'int main()':
exam.cpp:15:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   15 | #define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
      |                            ^
exam.cpp:81:5: note: in expansion of macro 'ff'
   81 |     ff(i,0,n) cin>>a[i];
      |     ^~
exam.cpp:15:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   15 | #define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
      |                            ^
exam.cpp:82:5: note: in expansion of macro 'ff'
   82 |     ff(i,0,n) cin>>b[i];
      |     ^~
exam.cpp:15:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   15 | #define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
      |                            ^
exam.cpp:93:9: note: in expansion of macro 'ff'
   93 |         ff(i,0,n)
      |         ^~
exam.cpp:17:29: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   17 | #define bff(i,a,b) for (int (i) = (b)-1; (i) >= (a); (i)--)
      |                             ^
exam.cpp:97:17: note: in expansion of macro 'bff'
   97 |                 bff(j,0,i)
      |                 ^~~
exam.cpp:15:28: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   15 | #define ff(i,a,b) for (int (i) = (a); (i) < (b); (i)++)
      |                            ^
exam.cpp:102:17: note: in expansion of macro 'ff'
  102 |                 ff(j,i+1,n)
      |                 ^~
exam.cpp:17:29: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   17 | #define bff(i,a,b) for (int (i) = (b)-1; (i) >= (a); (i)--)
      |                             ^
exam.cpp:116:9: note: in expansion of macro 'bff'
  116 |         bff(i,0,n)
      |         ^~~
exam.cpp:18:30: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   18 | #define bfff(i,a,b) for (int (i) = (b); (i) >= (a); (i)--)
      |                              ^
exam.cpp:120:13: note: in expansion of macro 'bfff'
  120 |             bfff(j,0,i)
      |             ^~~~

• Subtask 1: 14 / 14
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22