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  1. /**
  2.  * File              : BINARY.cpp
  3.  * Author            : hungeazy
  4.  * Date              : 27.09.2023
  5.  * Last Modified Date: 27.09.2023
  6.  * Last Modified By  : hungeazy
  7.  */
  8. #include <bits/stdc++.h>
  9. #pragma GCC optimize("O3")  
  10. #pragma GCC optimize("unroll-loops")  
  11. #pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")  
  12. using namespace std;
  13. #define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
  14. #define int long long
  15. #define ull unsigned long long
  16. #define sz(x) x.size()
  17. #define sqr(x) (1LL * (x) * (x))
  18. #define all(x) x.begin(), x.end()
  19. #define fill(f,x) memset(f,x,sizeof(f))
  20. #define FOR(i,l,r) for(int i=l;i<=r;i++)
  21. #define FOD(i,r,l) for(int i=r;i>=l;i--)
  22. #define ii pair<int,int>
  23. #define iii pair<int,ii>
  24. #define vi vector<int>
  25. #define vii vector<ii>
  26. #define mii map<int,int>
  27. #define fi first
  28. #define se second
  29. #define pb push_back
  30. #define MOD 1000000007
  31. #define __lcm(a,b) (1ll * ((a) / __gcd((a), (b))) * (b))
  32. #define YES cout << "YES\n"
  33. #define NO cout << "NO\n"
  34. #define MASK(i) (1LL << (i))
  35. #define c_bit(i) __builtin_popcountll(i)
  36. #define BIT(x,i) ((x) & MASK(i))
  37. #define SET_ON(x,i) ((x) | MASK(i))
  38. #define SET_OFF(x,i) ((x) & ~MASK(i))
  39. #define oo 1e18
  40. #define name ""
  41. #define endl '\n'
  42. #define time() cout << "-------------Time:" << 1000.0 * clock() / CLOCKS_PER_SEC << "ms.";
  43. template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
  44. template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }
  45. const int N = (int)1e6+10;
  46. int dp[N];
  47.  
  48. main()
  49. {
  50.     fast;
  51.     // freopen((TEMPLATE+".inp").c_str(),"r",stdin);
  52.     // freopen((TEMPLATE+".out").c_str(),"w",stdout);
  53.     string s;
  54.     int n,dem=0,x=0,y=0;
  55.     cin>>s;
  56.     n=s.size();
  57.     s=' '+s;
  58.     FOR(i,1,n)
  59.     {
  60.         if (s[i]=='1')
  61.         {
  62.             dem++;
  63.             dp[i]=dp[i-1];
  64.         }
  65.         else
  66.             if (dem&1) dp[i]=dp[i-1]+x, y++;
  67.             else dp[i]=dp[i-1]+y, x++;
  68.     }
  69.     cout<<dp[n];
  70.     return 0;
  71. }
  72. // ██░ ██  █    ██  ███▄    █   ▄████
  73. //▓██░ ██▒ ██  ▓██▒ ██ ▀█   █  ██▒ ▀█▒
  74. //▒██▀▀██░▓██  ▒██░▓██  ▀█ ██▒▒██░▄▄▄░
  75. //░▓█ ░██ ▓▓█  ░██░▓██▒  ▐▌██▒░▓█  ██▓
  76. //░▓█▒░██▓▒▒█████▓ ▒██░   ▓██░░▒▓███▀▒
  77. // ▒ ░░▒░▒░▒▓▒ ▒ ▒ ░ ▒░   ▒ ▒  ░▒   ▒
  78. // ▒ ░▒░ ░░░▒░ ░ ░ ░ ░░   ░ ▒░  ░   ░
  79. // ░  ░░ ░ ░░░ ░ ░    ░   ░ ░ ░ ░   ░
  80. // ░  ░  ░   ░              ░       ░
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/XaYwEM
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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