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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int g,n;
- while(scanf("%d %d",&n,&g)!=EOF)
- {
- int a,b,sum=0,i,j;
- vector<int>v;
- for(i=0; i<n; i++)
- {
- scanf("%d %d",&a,&b);
- if(a-b>0)
- sum+=3;
- else if(a-b==0)
- {
- if(g>0)
- {
- sum+=3;
- g--;
- }
- else
- {
- sum++;
- }
- }
- else
- v.push_back(b-a);
- }
- sort(v.begin(),v.end());
- if(g>0&&v.size()>0)
- {
- for(i=0; i<v.size(); i++)
- {
- if(g>v[i])
- {
- sum+=3;
- g-=(v[i]+1) ;
- }
- else if(g==v[i])
- {
- sum++;
- g+=v[i];
- break;
- }
- else
- break;
- }
- }
- cout<<sum<<endl;
- v.clear();
- }
- return 0;
- }
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