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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     if(fopen("phone.inp","r"))
  7.     {
  8.         freopen("phone.inp","r",stdin);
  9.         freopen("phone.out","w",stdout);
  10.     }
  11.     ios_base::sync_with_stdio(0);
  12.     cin.tie(0);
  13.  
  14.     long long n, m;
  15.     cin >> n >> m;
  16.  
  17.     vector<pair<long long,long long>> a(n);
  18.  
  19.     for (int i = 0; i < n; i++)
  20.         cin >> a[i].first >> a[i].second;
  21.  
  22.     sort(a.begin(), a.end());
  23.  
  24.     long long res = 0;
  25.     long long prev = 0;
  26.  
  27.     for (int i = 0; i < n; i++)
  28.     {
  29.         long long c = a[i].second;
  30.         if (c > prev)
  31.             res += (c - prev);
  32.         prev = c;
  33.     }
  34.  
  35.     cout << res;
  36. }
  37.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/7Dkdeu
language:
C++14 (gcc 8.3)
created:
21 hours ago
visibility:
public

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