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  1. /*----<Bồ tác phù hộ code không bị bug>--------
  2.                _oo0oo_ 
  3.               o8888888o 
  4.               88" . "88 
  5.               (| -_- |) 
  6.               0\  =  /0 
  7.             ___/`---'\___ 
  8.           .' \|     |// '. 
  9.          / \|||  :  |||// \ 
  10.         / _||||| -:- |||||- \ 
  11.        |   | \  -  /// |   | 
  12.        | \_|  ''\---/''  |_/ | 
  13.        \  .-\__  '-'  ___/-. / 
  14.      ___'. .'  /--.--\  `. .'___ 
  15.   ."" '<  `.___\_<|>_/___.' >' "". 
  16.  | | :  `- \`.;`\ _ /`;.`/ - ` : | | 
  17.  \  \ `_.   \_ __\ /__ _/   .-` /  / 
  18. =====`-.____`.___ \_____/___.-`___.-'===== 
  19.                `=---='
  20. ------------------<>-------------------------*/
  21.  
  22. #include <bits/stdc++.h>
  23.  
  24. #define int            long long
  25. #define fi             first
  26. #define se             second
  27. #define all(x)         x.begin(), x.end()
  28. #define rall(x)        x.rbegin(), x.rend()
  29. #define fr(x, l, r)    for (int x = l; x < r; x++)
  30. #define frr(x, l, r)   for (int x = l; x <= r; x++)
  31. #define fd(x, l, r)    for (int x = l; x >= r; x--)
  32. #define cs             const
  33. #define TIME           (1.0*clock() / CLOCKS_PER_SEC)
  34. #define RUNTIME        cerr << "\n" << "Runtime: " << TIME << "s\n";
  35. #define Fastio         ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  36.  
  37. typedef double               db;
  38. typedef std::string         str;
  39. typedef std::vector<int>    vi;
  40. typedef std::greater<int>   gi;
  41. typedef std::map<int, int>  mii;
  42. typedef std::pair<int, int> ii;
  43.  
  44. cs int N   = 1e6 + 5;
  45. cs int oo  = 1e18;
  46.  
  47. using namespace std;
  48.  
  49. signed main(){
  50.    Fastio;
  51.         int n; cin >> n;
  52.         int a[n];
  53.         int chan = 0, le = 0;
  54.         fr(i,0,n){
  55.           cin >> a[i];
  56.           if (a[i] % 2 == 0) ++chan;
  57.           else ++le;
  58.         }
  59.       int sum = chan * (chan - 1)/2;
  60.       int tong = le * (le - 1)/2;
  61.       cout << sum + tong;
  62.   RUNTIME;
  63.     return 0;
  64. }
Success #stdin #stdout #stderr 0.04s 5220KB
comments (?)
stdin
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Standard input is empty
stdout
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8814815866748
stderr
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Runtime: 0.037473s
https://ideone.com/Jr6b5Q
cặp số A[i] và A[j] với i khác j mà tổng 2 số này là 1 số chẵn
language:
C++14 (clang 8.0)
created:
58 days ago
visibility:
public

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