Submission #698628

#	Time	Username	Problem	Language	Result	Execution time	Memory
698628		Baytoro	Collecting Stamps 3 (JOI20_ho_t3)	C++17	100 / 100	196 ms	135292 KiB

ho_t3

#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
#define endl '\n'
#define int long long
#define ll long long
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
const ll INF=1e18,mod=1e9+7;
const int N=205;
int dp[N][N][N][2],x[N],t[N],n,L;
void solve(){
	cin>>n>>L;
	for(int i=1;i<=n;i++) cin>>x[i];
	for(int i=1;i<=n;i++) cin>>t[i];
	memset(dp,0x3f3f3f3f,sizeof(dp));
	int S=dp[0][0][0][0];
	dp[0][0][0][0]=dp[0][0][0][1]=0;
	for(int i=0;i<n;i++){
		for(int l=0;l<=n;l++){
			for(int r=0;r<=n;r++){
				if(l+r>=n) continue;
				for(int k=0;k<2;k++){
					int a=dp[i][l][r][k];
					if(k==0) a+=(x[l+1]-x[l]);
					else     a+=(L-x[n+1-r]+x[l+1]);
					dp[i+(a<=t[l+1])][l+1][r][0]=min(dp[i+(a<=t[l+1])][l+1][r][0],a);
					a=dp[i][l][r][k];
					if(k==1) a+=(x[n+1-r]-x[n-r]+L)%L;
					else     a+=(x[l]+L-x[n-r]);
					dp[i+(a<=t[n-r])][l][r+1][1]=min(dp[i+(a<=t[n-r])][l][r+1][1],a);
				}
			}
		}
	}
	int ans=0;
	for(int i=1;i<=n;i++){
		for(int l=0;l<=n;l++)
			for(int r=0;r<=n;r++)
				if(dp[i][l][r][0]!=S || dp[i][l][r][1]!=S) ans=i;
	}
	cout<<ans;
}
main(){
	ios;
	int T=1;
	//cin>>T;
	while(T--){
		solve();
	}
}

Compilation message (stderr)

ho_t3.cpp:51:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   51 | main(){
      | ^~~~
ho_t3.cpp: In function 'void fopn(std::string)':
ho_t3.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t3.cpp:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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