Submission #698612

#	Time	Username	Problem	Language	Result	Execution time	Memory
698612		Baytoro	Collecting Stamps 3 (JOI20_ho_t3)	C++17	0 / 100	1 ms	2288 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;
map<int,int> dp[N][N];
int x[N],t[N];
int n,L,s;
int f(int l, int r){
	if(l>r) swap(l,r);
	return min(r-l,L-r+l);
}
int rec(int i, int j, int time){
	if(abs(i-j)==1) return 0;
	if(dp[i][j].count(time)) return dp[i][j][time];
	int c=i,l=min(i,j),r=max(i,j);
	int ans=rec(l+1,r,min(s,f(x[c],x[r-1])+time))+(f(x[c],x[l+1])+time<=t[l+1]);
	ans=max(ans,rec(r-1,l,min(s,f(x[c],x[r-1])+time))+(f(x[c],x[r-1])+time<=t[r-1]));
	dp[i][j][time]=ans;
	return ans;
}
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];
		s=max(s,t[i]+1);
	}
	cout<<rec(0,n+1,0);
}
main(){
	ios;
	int T=1;
	//cin>>T;
	while(T--){
		solve();
	}
}

Compilation message (stderr)

ho_t3.cpp:44:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   44 | 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: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75