제출 #467641

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
467641		urosk	Exam (eJOI20_exam)	C++14	12 / 100	29 ms	2976 KiB

exam

// __builtin_popcount(x) broj bitova
// __builtin_popcountll(x) long long
#define here cerr<<"---------------------------\n"
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#define ld double
#define ll long long
#define ull unsigned long long
#define llinf 100000000000000000LL // 10^17
#define iinf 2000000000 // 2*10^9
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) int(a.size())
#define all(a) a.begin(),a.end()
#define rall(a) a.begin(),a.end(),greater<int>()
#define getunique(v) {sort(all(v)); v.erase(unique(all(v)), v.end());}

using namespace std;
using namespace __gnu_pbds;

typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

void setIO(string inoutname)
{
	freopen((inoutname+".in").c_str(),"r",stdin);
    	freopen((inoutname+".out").c_str(),"w",stdout);
}
ll gcd(ll a, ll b)
{
   if(b==0) return a;
   if(a==0) return b;
   if(a>=b)  return gcd(a%b,b);
   return  gcd(a,b%a);
}
#define maxn 100005
#define maxn2 5005
#define logn 30
ll n;
ll a[maxn];
ll b[maxn];
ll dp[maxn2][maxn2];
ll st[maxn2][logn];
ll get(ll l,ll r){
    ll len = r-l+1;
    ll k = 0;
    while((1<<(k+1))<=len){
        k++;
    }
    return max(st[l][k],st[r-(1<<k)+1][k]);
}
void tc(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
    cin >> n;
    for(ll i = 1;i<=n;i++) cin >> a[i];
    bool s2 = 1;
    for(ll i = 1;i<=n;i++){
        cin >> b[i];
        if(i>1&&b[i]!=b[i-1]) s2 = 0;
    }
    if(s2){
        ll cnt = 0;
        bool e = 0;
        ll ans = 0;
        for(ll i = 1;i<=n;i++){
            if(a[i]>b[1]){
                if(e) ans+=cnt;
                cnt = 0;
                e = 0;
            }else{
                cnt++;
                if(a[i]==b[1]) e = 1;
            }
        }
        if(e) ans+=cnt;
        cout<<ans<<endl;
        return;
    }
    for(ll i = 1;i<=n;i++) st[i][0] = a[i];
    for(ll j = 1;j<logn;j++){
        for(ll i = 1;i<=n;i++){
            st[i][j] = max(st[i][j-1],st[i+(1<<(j-1))][j-1]);
        }
    }
    for(ll i = 1;i<=n;i++){
        for(ll j = 1;j<=n;j++){
            if(a[i]==b[j]){
                ll mx = get(min(i,j),max(i,j));
                dp[i][j] = dp[i-1][j-1] + 1;
            }else{
                dp[i][j] = max(dp[i-1][j],dp[i][j-1]);
                dp[i][j] = max(dp[i][j],dp[i-1][j-1]);
            }
        }
    }
    cout<<dp[n][n]<<endl;
}
int main(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
	//setIO("lol");
	int t; t = 1;
	while(t--){
		tc();
	}
	return 0;
}
/*
4
10 1 9 2
10 9 10 9
2
out: 2
--
3
10 1 1
1 1 1
*/

컴파일 시 표준 에러 (stderr) 메시지

exam.cpp: In function 'void tc()':
exam.cpp:94:20: warning: unused variable 'mx' [-Wunused-variable]
   94 |                 ll mx = get(min(i,j),max(i,j));
      |                    ^~
exam.cpp: In function 'void setIO(std::string)':
exam.cpp:32:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |  freopen((inoutname+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
exam.cpp:33:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |      freopen((inoutname+".out").c_str(),"w",stdout);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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