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  1. #include <bits/stdc++.h>
  2.  
  3. typedef long double ld;
  4. #define int long long
  5.  
  6. #define gcd            __gcd
  7. #define endl           "\n"
  8. #define setbits(x)     __builtin_popcountll(x)
  9. #define zrobits(x)     __builtin_ctzll(x)
  10. #define mod            1000000007
  11. #define mod2           998244353
  12. #define maxe           *max_element
  13. #define mine           *min_element
  14. #define inf            1e18
  15. #define pb             push_back
  16. #define all(x)         x.begin(), x.end()
  17. #define f              first
  18. #define s              second
  19. #define lb             lower_bound
  20. #define ub             upper_bound
  21. #define ins            insert
  22. #define sz(x)          (int)(x).size()
  23. #define mk             make_pair
  24. #define deci(x, y)     fixed<<setprecision(y)<<x
  25. #define w(t)           int t; cin>>t; while(t--)
  26. #define nitin          ios_base::sync_with_stdio(false); cin.tie(nullptr)
  27. #define PI             3.141592653589793238
  28. #define mem0(x)        memset(x,0,sizeof x)
  29. #define mem1(x)        memset(x,-1,sizeof x)
  30. #define pr             pair<int,int>
  31. #define vi             vector<int>
  32. #define vvi            vector<vi>
  33. #define vpr            vector<pr>
  34. using namespace std;
  35. template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.f << ", " << p.second << ')'; }
  36. template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { os << '{'; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << '}'; }
  37.  
  38. void dbg_out() { cerr << endl; }
  39. template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cerr << ' ' << H; dbg_out(T...); }
  40.  
  41. #ifdef NITIN
  42. #define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
  43. #else
  44. #define dbg(...)
  45. #endif
  46.  
  47. int power(int x, int y, int p) {
  48.     int res = 1;
  49.     x = x % p;
  50.     while (y > 0) {
  51.         if (y & 1)
  52.             res = (res * x) % p;
  53.         y = y >> 1;
  54.         x = (x * x) % p;
  55.     }
  56.     return res;
  57. }
  58. int modi(int a, int m) {
  59.     return power(a, m - 2, m);
  60. }
  61. void solve() {
  62.     int b,w;
  63.     cin>>b>>w;
  64.     int top=b*(b-1);
  65.     top%=mod;
  66.     int bottom=((b+w-1)*(b+w-1)-w*w);
  67.     bottom%=mod;
  68.     top+=bottom;
  69.     top%=mod;
  70.     top*=w;
  71.     top%=mod;
  72.     bottom*=(b+2*w);
  73.     bottom%=mod;
  74.     top%=mod;
  75.     bottom%=mod;
  76.     top*=modi(bottom,mod);
  77.     cout<<top%mod<<endl;
  78.  
  79. }
  80.  
  81. int32_t main() {
  82.     nitin;
  83.  
  84.     solve();
  85. }
Success #stdin #stdout 0s 5432KB
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-9750542
https://ideone.com/vO35FY
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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