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  1. // ~~ icebear ~~
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. typedef long long ll;
  6. typedef pair<int, int> ii;
  7. typedef pair<int, ii> iii;
  8.  
  9. template<class T>
  10.     bool minimize(T &a, const T &b) {
  11.         if (a > b) return a = b, true;
  12.         return false;
  13.     }
  14.  
  15. template<class T>
  16.     bool maximize(T &a, const T &b) {
  17.         if (a < b) return a = b, true;
  18.         return false;
  19.     }
  20.  
  21. #define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
  22. #define FORR(i,a,b) for(int i=(a); i>=(b); --i)
  23. #define REP(i, n) for(int i=0; i<(n); ++i)
  24. #define RED(i, n) for(int i=(n)-1; i>=0; --i)
  25. #define MASK(i) (1LL << (i))
  26. #define BIT(S, i) (((S) >> (i)) & 1)
  27. #define mp make_pair
  28. #define pb push_back
  29. #define fi first
  30. #define se second
  31. #define all(x) x.begin(), x.end()
  32. #define task "icebear"
  33. /*END OF TEMPLATE. ICEBEAR AND THE CAT WILL WIN VOI */
  34.  
  35. const int MOD = 1e9 + 7;
  36. const int inf = 1e9 + 27092008;
  37. const ll INF = 1e18 + 27092008;
  38. const int N = 2e5 + 5;
  39. int n;
  40. ii range[N];
  41. int p[N], res;
  42.  
  43. void init(void) {
  44.     cin >> n;
  45.     FOR(i, 1, n) {
  46.         int s, t;
  47.         cin >> s >> t;
  48.         range[i] = {s - t, s + t};
  49.     }
  50. }
  51.  
  52. void process(void) {
  53.     sort(range + 1, range + n + 1, [&](const ii &x, const ii &y){
  54.         if (x.fi != y.fi) return x.fi < y.fi;
  55.         return x.se > y.se;
  56.     });
  57.  
  58.     FOR(i, 1, n) {
  59.         int pos = lower_bound(p + 1, p + res + 1, range[i].se) - p;
  60.         p[pos] = range[i].se;
  61.         maximize(res, pos);
  62.     }
  63.     cout << res;
  64. }
  65.  
  66. int main() {
  67.     ios_base::sync_with_stdio(0);
  68.     cin.tie(0); cout.tie(0);
  69.     if (fopen(task".inp", "r")) {
  70.         freopen(task".inp", "r", stdin);
  71.         freopen(task".out", "w", stdout);
  72.     }
  73.     int tc = 1;
  74. //    cin >> tc;
  75.     while(tc--) {
  76.         init();
  77.         process();
  78.     }
  79.     return 0;
  80. }
  81.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/jjunns
language:
C++14 (gcc 8.3)
created:
10 hours ago
visibility:
public

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