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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const long long MaxN = 1e5 + 5;
  4. pair<long long, long long> pr[MaxN];
  5. long long n;
  6. int main()
  7. {
  8.     ios_base::sync_with_stdio(0);
  9.     cin.tie(0);
  10.     if (fopen("suml.inp", "r"))
  11.     {
  12.         freopen("suml.inp", "r", stdin);
  13.         freopen("suml.out", "w", stdout);
  14.     }
  15.     cin >> n;
  16.     for (long long i=1; i<=n; i++)
  17.     {
  18.         cin >> pr[i].first >> pr[i].second;
  19.         if(pr[i].second !=0)
  20.         {
  21.             pr[i].second += (pr[i].first-1);
  22.         }
  23.         else
  24.         {
  25.             pr[i].second = pr[i].first;
  26.         }
  27.     }
  28.     sort(pr+1,pr+n+1);
  29.     long long ans = pr[1].second - pr[1].first +1;
  30.     long long l = pr[1].first, r=pr[1].second;
  31.     for (long long i=2; i<=n; i++)
  32.     {
  33.         if(r<pr[i].first)
  34.         {
  35.             l = pr[i].first, r=pr[i].second;
  36.             ans += r-l+1;
  37.         }
  38.         if(r>=pr[i].first)
  39.         {
  40.             if(pr[i].second <= r) continue;
  41.             ans += (pr[i].second - r);
  42.             r = pr[i].second;
  43.         }
  44.     }
  45.     cout << ans;
  46. }
  47.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/PsTyyW
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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