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- #include <fstream>
- #include <iostream>
- using namespace std;
- int v[105];
- ifstream f("bac.in");
- int main()
- {
- int n,i,x,j,k,s=0;
- f>>n>>x;
- for(i=1;i<=n;i++)
- f>>v[i];
- j=n;
- for(i=1;i<=j;i++)
- {
- while(i<j and v[i]+v[j]>x)
- j-=1;
- if(i<j)
- s+=(j-i);
- }
- cout<<s;
- return 0;
- }
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