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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. const int N=2e5+5;
  5. ll n,m,a[N],b[N];
  6. bool can(ll mid)
  7. {
  8.     ll cur=a[0],o=0;
  9.     for(int i=1;i<n;i++)
  10.     {
  11.         if(cur+a[i]<=mid)
  12.         {
  13.             cur+=a[i];
  14.         }
  15.         else
  16.         {
  17.             while(o<m&&cur+a[i]>mid)
  18.             {
  19.                 cur+=b[o];
  20.                 o++;
  21.             }
  22.             cur=max(0LL,cur);
  23.             cur+=a[i];
  24.             if(cur>mid) return 0;
  25.         }
  26.     }
  27.     return cur<=mid;
  28. }
  29. signed main()
  30. {
  31.     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  32.     cin>>n>>m;
  33.     for(int i=0;i<n;i++)
  34.     {
  35.         cin>>a[i];
  36.     }
  37.     for(int o=0;o<m;o++)
  38.     {
  39.         cin>>b[o];
  40.     }
  41.     ll l=*max_element(a,a+n),r=1e17,ans=l;
  42.     while(l<=r)
  43.     {
  44.         ll mid=(l+r)/2;
  45.         if(can(mid))
  46.         {
  47.             ans=mid;
  48.             r=mid-1;
  49.         }
  50.         else
  51.         {
  52.             l=mid+1;
  53.         }
  54.     }
  55.     cout<<ans;
  56.     return 0;
  57. }
Success #stdin #stdout 0s 5280KB
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https://ideone.com/lvafJU
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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