제출 #462355

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
462355		idas	Exam (eJOI20_exam)	C++11	0 / 100	1088 ms	90204 KiB

exam

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define SZ(x) ((int)((x).size()))
#define LE(vec) vec[vec.size()-1]
#define TSTS int t; cin >> t; while(t--)solve()

const int INF = 1e9;
const long long LINF = 1e18;
const long double PI = asin(1)*2;
const int MOD = 1e9+7;

using namespace std;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef long long ll;
typedef long double ld;

void setIO()
{
    FAST_IO;
}

void setIO (string s)
{
    setIO();
 	freopen((s+".in").c_str(),"r",stdin);
 	freopen((s+".out").c_str(),"w",stdout);
}

const int N=5e3+10;
int n, a[N], b[N], t[2*N];
ll dp[N][N];

void build()
{
    for(int i=n-1; i>=0; i--) t[i]=max(t[i<<1], t[i<<1|1]);
}

int get(int l, int r)
{
    int ret=0;
    for(l+=n, r+=n; l<r; l>>=1, r>>=1){
        if(l&1) ret=max(ret, t[l++]);
        if(r&1) ret=max(ret, t[--r]);
    }
    return ret;
}

int main()
{
    setIO();
    cin >> n;
    FOR(i, 0, n)
    {
        cin >> a[i];
        t[i+n]=a[i];
    }
    FOR(i, 0, n) cin >> b[i];
    build();

    FOR(i, 0, n)
    {
        int mx=get(0, i+1);
        if(b[0]==mx){
            dp[0][i]=max(dp[0][i], 1LL);
        }
    }

    ll ans=0;
    FOR(i, 1, n)
    {
        FOR(j, 0, n)
        {
            if(i+j+1>N) continue;
            ll mx1=get(i-1, i+j+1), mx2=get(i, i+j+1);
            ll val=max(dp[i-1][j+1]+(mx1==b[i]?1:0), dp[i-1][0]+(mx2==b[i]?1:0));
            dp[i][j]=max(dp[i][j], val);
        }
    }

    FOR(i, 0, n)
    {
        FOR(j, 0, n)
        {
            ans=max(ans, dp[i][j]);
         //   cout << dp[i][j] << " ";
        }
        //cout << '\n';
    }
    cout << ans;
}

컴파일 시 표준 에러 (stderr) 메시지

exam.cpp: In function 'void setIO(std::string)':
exam.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
exam.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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