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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ms(s,n) memset(s,n,sizeof(s))
  5. #define all(a) a.begin(),a.end()
  6. #define present(t, x) (t.find(x) != t.end())
  7. #define sz(a) int((a).size())
  8. #define FOR(i, a, b) for (int i = (a); i < (b); ++i)
  9. #define FORd(i, a, b) for (int i = (a) - 1; i >= (b); --i)
  10. #define pb push_back
  11. #define pf push_front
  12. #define fi first
  13. #define se second
  14. #define mp make_pair
  15.  
  16. typedef long long ll;
  17. typedef unsigned long long ull;
  18. typedef long double ld;
  19. typedef pair<int,int> pi;
  20. typedef vector<int> vi;
  21. typedef vector<pi> vii;
  22.  
  23. const int MOD = (int) 1e9+7;
  24. const int INF = (int) 1e9+1;
  25. inline ll gcd(ll a,ll b){ll r;while(b){r=a%b;a=b;b=r;}return a;}
  26. inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
  27.  
  28. bool cmp(pi a, pi b){
  29. 	return a.fi < b.fi;
  30. }
  31.  
  32.  
  33. int main(){
  34. 	#ifndef ONLINE_JUDGE
  35. 	freopen("input.txt", "r", stdin);
  36. 	freopen("output.txt", "w", stdout);
  37. 	#endif
  38. 	int n; cin >> n;
  39. 	vii a(n);
  40. 	for(int i = 0; i < n; i++){
  41. 		cin >> a[i].fi >> a[i].se;
  42. 	}
  43. 	sort(all(a), cmp);
  44. 	ll res = 0, start = 0;
  45. 	for(auto it : a){
  46. 		start += it.fi;
  47. 		//cout << start << endl;
  48. 		res += it.se - start;
  49. 	}	
  50. 	cout << res << endl;
  51. 	return 0;
  52. }
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/hmcSBI
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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