Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
#define fastio() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define loop(i,a,b) for(int i=a;i<b;i++)
#define test() int t;cin>>t;loop(test,1,t+1)
#define pb push_back
#define eb emplace_back
#define mkp make_pair
#define nl cout<<"\n"
#define sp cout<<" "
#define F first
#define S second
#define vi vector<int>
#define vl vector<ll>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vii vector<pii>
#define vll vector<pll>
#define MOD 1000000007
#define all(x) x.begin(),x.end()

template<class C> void min_self( C &a, C b ){ a = min(a,b); }
template<class C> void max_self( C &a, C b ){ a = max(a,b); }

void mod( ll &n, ll m=MOD ){ n%=m,n+=m,n%=m; }

const int MAXN = 1e5+5;
int dx[] = {1,0,-1,0};
int dy[] = {0,1,0,-1};

int main() 
{
    fastio();

    int n;
    cin>>n;
    vector<int>a(n+1),b(n);
    for(int i=0;i<n+1;i++) cin>>a[i];
    for(int i=0;i<n;i++) cin>>b[i];

    ll ans = 0, rem = a[n];
    for(int i=n-1;i>=0;i--)
    {
        if( rem > 0 )
        {
            ans += min(rem,b[i]);
            b[i] = max(0,b[i]-rem);
        }
        ans += min(a[i],b[i]);
        rem = max(0, a[i]-b[i]);
    }
    cout<<ans;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:49:23: error: no matching function for call to 'min(ll&, __gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type&)'
   49 |             ans += min(rem,b[i]);
      |                    ~~~^~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:49:23: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'})
   49 |             ans += min(rem,b[i]);
      |                    ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:49:23: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   49 |             ans += min(rem,b[i]);
      |                    ~~~^~~~~~~~~~
a.cc:50:23: error: no matching function for call to 'max(int, ll)'
   50 |             b[i] = max(0,b[i]-rem);
      |                    ~~~^~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:50:23: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   50 |             b[i] = max(0,b[i]-rem);
      |                    ~~~^~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:50:23: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   50 |             b[i] = max(0,b[i]-rem);
      |                    ~~~^~~~~~~~~~~~