Submission #4027498

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n,x;cin >> n >> x;
	vector<int> a(n);
	rep(i,n) cin >> a.at(i);
	ll ans=0;
	rep(i,n-1){
		if(a.at(i)+a.at(i+1)>x){
			if(a.at(i+1)>a.at(i)+a.at(i+1)-x){
				ans+=a.at(i)+a.at(i+1)-x;
				a.at(i+1)-=a.at(i)+a.at(i+1)-x;
			}
			else{
				ans+=a.at(i+1);
				ans+=a.at(i)-x;
				a.at(i+1)=0;
			}
		}
	}
	cout << ans << endl;
}

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