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- #include <iostream>
- using namespace std;
- int main()
- {
- int N;
- cin>>N;
- int Ku[N];
- int Pi[N];
- int db=0;
- for(int i=0; i<N; i++) {
- cin>>Pi[i]>>Ku[i];
- }
- for(int j=0; j<N; j++) {
- if(Ku[j]<Pi[j]) {
- db=db+1;
- }
- }
- cout<<db<<endl;
- return 0;
- }
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