oj.uz

Submission #356782

# Submission time Handle Problem Language Result Execution time Memory
356782 2021-01-23T16:45:18 Z YJU Sparklers (JOI17_sparklers) C++14
0 / 100
 131 ms 31852 KB 
#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=2e3+5;
const ld pi=acos(-1);
const ll INF=(1LL<<60);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

ll n,JOI,t,dp[N][N],x[N],u[N];

bool ck(ll k){
	memset(dp,0,sizeof(dp));
	REP1(i,n)x[i]=u[i]-2*k*t*i;
	dp[JOI][JOI]=1;
	for(int L=1;L<=n;L++){
		for(int i=1;i+L<=n;i++){
			if(i+L<=n&&x[i]>=x[i+L])dp[i][i+L]|=dp[i][i+L-1];
			if(i-1>=1&&x[i-1]>=x[i+L-1])dp[i-1][i+L-1]|=dp[i][i+L-1];
		}
	}
	return dp[1][n];
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>JOI>>t;
	REP1(i,n)cin>>u[i];
	ll l=0,r=1e9+10;
	while(r-l>1){
		ll mid=(l+r)>>1;
		if(ck(mid)){
			r=mid;
		}else{
			l=mid;
		}
	}
	cout<<r<<"\n";
	return 0;
}

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 131 ms 31852 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 131 ms 31852 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Incorrect 131 ms 31852 KB Output isn't correct
2 Halted 0 ms 0 KB -