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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b) {
  14.     int x = 1;
  15.     a %= M;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % M; 
  18.         a = (a * a) % M;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27.  
  28.  
  29.  
  30. vector<pair<int,int>> a;
  31.  
  32. int consistency(int n){
  33.  
  34.     sort(begin(a), end(a), [](const pair<int,int>& a, const pair<int,int>& b){
  35.         return a.second < b.second;
  36.     });
  37.  
  38.     int ans = 0;
  39.     int x = -1, y = -1;
  40.     for(int i=0; i<n; i++){
  41.         int s = a[i].first;
  42.         int e = a[i].second;
  43.  
  44.         if(x==-1 && y==-1){
  45.             x = s;
  46.             y = e;
  47.             ans++;
  48.         }
  49.         else if(y > s){
  50.             continue;
  51.         }
  52.         else{
  53.             x = s;
  54.             y = e;
  55.             ans++;
  56.         }
  57.     }
  58.  
  59.  
  60.  
  61.     return ans;    
  62. }
  63.  
  64.  
  65.  
  66.  
  67.  
  68.  
  69.  
  70.  
  71.  
  72.  
  73.  
  74.  
  75.  
  76.  
  77.  
  78. int practice(int n){
  79.  
  80.  
  81.     return 0;
  82. }
  83.  
  84.  
  85.  
  86.  
  87.  
  88. void solve() {
  89.  
  90.     int n;
  91.     cin>> n;
  92.  
  93.     a.resize(n);
  94.     for(int i=0; i<n; i++){
  95.         int x, y;
  96.         cin >> x >> y;
  97.         a[i] = {x, y};
  98.     }
  99.  
  100.     cout << consistency(n) << endl;
  101.  
  102.  
  103. }
  104.  
  105.  
  106.  
  107.  
  108.  
  109. int32_t main() {
  110.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  111.  
  112.     int t = 1;
  113.     // cin >> t;
  114.     while (t--) {
  115.         solve();
  116.     }
  117.  
  118.     return 0;
  119. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/EuYg42
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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