Submission #840151

#	Time	Username	Problem	Language	Result	Execution time	Memory
840151		TsotneSV	Exam (eJOI20_exam)	C++17	0 / 100	284 ms	4968 KiB

exam

#pragma gcc diagnostic "-std=c++1z"
#include <bits/stdc++.h>
using namespace std;
/* /\_/\
  (= ._.)
  / >  \>
*/
//#define int long long

#define fi first
#define se second
#define pb push_back
#define ins insert
#define mp make_pair
#define endl "\n"
#define sz(x) (int) (x).size()
#define deb(x) cout<<(x)<<endl
#define all(x) (x).begin(),(x).end()
#define dbg(x) cerr<<#x<<" "<<x<<endl

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;

const ll inf=1e9;
const ll INF=1e18;
const ll mod=998244353;
const ll MOD=1e9+7;
const ll MAXN=2e5+5;

int n,A[5005],B[5005];
int dp[5005][2];
map<int,int> freq[5005];

void solve(){
    cin>>n;

    for(int i=1;i<=n;i++) cin>>A[i];

    for(int i=1;i<=n;i++) {
        cin>>B[i];
        freq[i][B[i]] = freq[i-1][B[i]] + 1;
    }

    dp[n+1][0] = dp[n+1][1] = 0;

    for(int i=n;i>0;i--) {
        dp[i][0] = max(dp[i+1][0],dp[i+1][1]) + (A[i] == B[i]);
        int mx = 0;
        for(int j=i;j<=n;j++) {
            mx = max(mx,A[j]);
            dp[i][1] = max(dp[i][1],freq[j][mx] - freq[i-1][mx] + max(dp[j+1][0],dp[j+1][1]));
        }

    } deb(max(dp[1][0],dp[1][1]));
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    int tt=1;
  //  cin>>tt;
    while(tt--){
        solve();
    }
}

Compilation message (stderr)

exam.cpp:1: warning: ignoring '#pragma gcc diagnostic' [-Wunknown-pragmas]
    1 | #pragma gcc diagnostic "-std=c++1z"
      |

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