Submission #1612087

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Source Code Expand

#include<iostream>
#include<cstdio>
#include<cstring>
template<typename T>inline void check_min(T a,T &b){if(a<b)b=a;}
template<typename T>inline void read(T &x)
{
	char c=x=0;
	for(c=getchar();!isdigit(c);c=getchar());
	for(;isdigit(c);c=getchar())x=(x<<3)+(x<<1)+(c^48);
}
namespace bf
{
	typedef long long ll;
	const int N=100010;
	const ll INF=9223372036854775807ll;
	int a[N],b[N];
	int n,m;
	ll ans;
	void initialize()
	{
		read(n),read(a[n]),read(m);
		for(int i=0;i<n;i++)
			read(a[i]);
		for(int i=1;i<=n;i++)
			b[i]=a[i]-a[i-1];
	}
	inline ll get_dis(int i,int j){return a[j]-b[j]-a[i];}
	void solve()
	{
		initialize();
		ans=a[n];

		for(int i=0,j;i<n;i=j)
		{
			for(j=i;j<n && get_dis(i,j+1)*2<=m;j++);

			ans+=m;
		}
		printf("%lld\n",ans);
	}
}
int main()
{
//	freopen("in","r",stdin);
//	freopen("out","w",stdout);
	bf::solve();
	return 0;
}

Submission Info

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