Submission #682785

#	Time	Username	Problem	Language	Result	Execution time	Memory
682785		Paul_Liao_1457	Collecting Stamps 3 (JOI20_ho_t3)	C++17	100 / 100	78 ms	130912 KiB

ho_t3

//記得跳題
#include<iostream>
#include<array>
#include<vector>
#include<string>
#include<algorithm>
#include<set>
#include<queue>
#include<stack>
#include<math.h>
#include<map>
#include<unordered_map>
#include<cstring>
#include<iomanip>
#include<bitset>
#include<tuple>
 
#define ll long long
#define LL __int128_t
#define DB double
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a,b) for(int i=a;i>=b;i--)
#define pb push_back
#define mp make_pair
#define INF (ll)(2e9)
#define MOD (ll)(1e9+7)
#define F first
#define S second
#define endl "\n"
#define AC ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
using namespace std;

template<class T> using PQ=priority_queue<T,vector<T>,less<T> >;

void file(){
    freopen("/Users/liaoyunyang/Desktop/meta_in.txt","r",stdin);
    freopen("/Users/liaoyunyang/Desktop/meta_out.txt","w",stdout);
}

/*int s[200005],seg[800005];

void build(int id,int l,int r){
    if(l==r){
        seg[id]=s[l]; return;
    }
    int mid=(l+r)>>1;
    build(id*2,l,mid);
    build(id*2+1,mid+1,r);
    seg[id]=max(seg[id*2],seg[id*2+1]);
}

int ask(int id,int l,int r,int L,int R){
    if(l>R||r<L) return 0;
    if(L<=l&&r<=R) return seg[id];
    int mid=(l+r)>>1;
    return max(ask(id*2,l,mid,L,R),ask(id*2+1,mid+1,r,L,R));
}
 */

ll dp[205][205][2][205],x[205],y[205],t[205];

signed main(){
    AC;
    int n,l; cin>>n>>l;
    FOR(i,1,n+1){
        cin>>x[i]; y[n-i+1]=l-x[i];
    }
    FOR(i,1,n+1) cin>>t[i];
    FOR(i,0,n+1)FOR(j,0,n+1)FOR(k,0,2)FOR(s,0,i+j+1) dp[i][j][k][s]=INF;
    dp[0][0][0][0]=dp[0][0][1][0]=0;
    int ans=0;
    FOR(i,0,n+1)FOR(j,0,n+1){
        if(i+j>n) break;
        FOR(k,0,2)FOR(s,0,min(n,i+j)+1)if(dp[i][j][k][s]!=INF){
            //cout<<"dp["<<i<<"]["<<j<<"]["<<k<<"]["<<s<<"]="<<dp[i][j][k][s]<<endl;
            ans=max(ans,s);
            if(k==0){
                if(dp[i][j][k][s]+x[i+1]-x[i]<=t[i+1]){
                    dp[i+1][j][k][s+1]=min(dp[i+1][j][k][s+1],dp[i][j][k][s]+x[i+1]-x[i]);
                }
                else{
                    dp[i+1][j][k][s]=min(dp[i+1][j][k][s],dp[i][j][k][s]+x[i+1]-x[i]);
                }
                if(dp[i][j][k][s]+y[j+1]+x[i]<=t[n-j]){
                    dp[i][j+1][k^1][s+1]=min(dp[i][j+1][k^1][s+1],dp[i][j][k][s]+y[j+1]+x[i]);
                }
                else{
                    dp[i][j+1][k^1][s]=min(dp[i][j+1][k^1][s],dp[i][j][k][s]+y[j+1]+x[i]);
                }
            }
            else{
                if(dp[i][j][k][s]+x[i+1]+y[j]<=t[i+1]){
                    dp[i+1][j][k^1][s+1]=min(dp[i+1][j][k^1][s+1],dp[i][j][k][s]+x[i+1]+y[j]);
                }
                else{
                    dp[i+1][j][k^1][s]=min(dp[i+1][j][k^1][s],dp[i][j][k][s]+x[i+1]+y[j]);
                }
                if(dp[i][j][k][s]+y[j+1]-y[j]<=t[n-j]){
                    dp[i][j+1][k][s+1]=min(dp[i][j+1][k][s+1],dp[i][j][k][s]+y[j+1]-y[j]);
                }
                else{
                    dp[i][j+1][k][s]=min(dp[i][j+1][k][s],dp[i][j][k][s]+y[j+1]-y[j]);
                }
            }
        }
    }
    cout<<ans<<endl;
}


/*

 */

Compilation message (stderr)

ho_t3.cpp: In function 'void file()':
ho_t3.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen("/Users/liaoyunyang/Desktop/meta_in.txt","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:38:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     freopen("/Users/liaoyunyang/Desktop/meta_out.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 75 / 75