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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. #define ll long long
  6. #define int long long
  7. #define pb push_back
  8. #define all(x) (x).begin(),(x).end()
  9. #define fi first
  10. #define se second
  11.  
  12. int const MAXN=1e6+10;
  13. int const INF=1e18;
  14.  
  15. void open(){
  16.     ios_base::sync_with_stdio(false);
  17.     cin.tie(NULL); cout.tie(NULL);
  18. //    freopen(TASK".INP","r",stdin);
  19. //    freopen(TASK".OUT","w",stdout);
  20. }
  21.  
  22. int s[MAXN],e[MAXN],a[MAXN];
  23. int n,q,ans,mx_tmp;
  24.  
  25. signed main(){
  26.     open();
  27.     cin>>n>>q;
  28.  
  29.     multiset<pair<int,int>> sum;
  30.  
  31.     for(int i=1;i<=n;i++){
  32.         cin>>e[i]>>s[i];
  33.         mx_tmp=max(mx_tmp,s[i]);
  34.         a[i]=s[i]+e[i];
  35.     }
  36.  
  37.     sort(a+1,a+n+1);
  38.  
  39.     for(int i=n;i>=1;i--){
  40.         if(q>0){
  41.             ans+=max(mx_tmp,a[i]);
  42.         }
  43.         else break;
  44.         q--;
  45.     }
  46.  
  47.     if(q>0)ans+=mx_tmp*q;
  48.  
  49.     cout<<ans;
  50.     return 0;
  51. }
Success #stdin #stdout 0s 5348KB
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https://ideone.com/7P2h6e
language:
C++ (gcc 8.3)
created:
33 minutes ago
visibility:
public

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