好的
破案了
代码格式问题仅此而已
AC CODE
```cpp
#include<bits/stdc++.h>
using namespace std;
const int N=1e8+5;
long long c,b,a[N],d=0;
int main(){
cin>>c>>b;
for(long long i=1;i<=c;i++){
cin>>a[i];
long long ppa;
if(a[i]+a[i-1]-b>=1 || a[i]+a[i+1]-b>=1) ppa=max(a[i]+a[i-1]-b,a[i]+a[i+1]-b);
else ppa=0;
a[i]-=ppa;
d+=ppa;
}
cout<<d;
}
```
by lan_chance @ 2023-10-27 22:20:33