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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define ull unsigned long long
  5. const ll N=1000005;
  6. const ll inf=1e18;
  7.  
  8. ull seg_len(ll l,ll r)
  9. {
  10.     if(l>r) return 0ULL;
  11.     return (ull)(r-l)+1ULL;
  12. }
  13.  
  14. void solve()
  15. {
  16.     //freopen(".inp","r",stdin);
  17.     //freopen(".out","w",stdout);
  18.     ll n,m;
  19.     cin>>n>>m;
  20.     if(m==0)
  21.     {
  22.         cout<<1<<"\n";
  23.         return;
  24.     }
  25.     ll l1=n-(m/2);
  26.     ll r1;
  27.     if(m>=2) r1=n+((m-2)/2);
  28.     else r1=n;
  29.  
  30.     ll half=(m-1)/2;
  31.     ll l2=-(n+half);
  32.     ll r2=-n+half;
  33.  
  34.     ull len1=seg_len(l1,r1);
  35.     ull len2=seg_len(l2,r2);
  36.  
  37.     ll il=max(l1,l2);
  38.     ll ir=min(r1,r2);
  39.     ull inter=seg_len(il,ir);
  40.  
  41.     ull ans=len1+len2-inter;
  42.     cout<<ans<<"\n";
  43. }
  44.  
  45. int main()
  46. {
  47.     ios_base::sync_with_stdio(0);
  48.     cin.tie(0);
  49.     solve();
  50. }
  51.  
Success #stdin #stdout 0.01s 5288KB
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187759337275967
https://ideone.com/j1mxTz
language:
C++14 (gcc 8.3)
created:
93 days ago
visibility:
secret

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