Codeforces Round #226 (Div. 2) A - Bear and Raspberry
#include<stdio.h>
#include<algorithm>
using namespace std;
int s[1005];
int main(){
int i,j,n,m,p,ans=0;
scanf("%d%d",&n,&m);
for(i=0;i<n;i++)
scanf("%d",&s[i]);
for(i=0;i<n-1;i++){
ans=max(ans,s[i]-s[i+1]-m);
}
printf("%d\n",ans);
}
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