题解

#include<iostream>
using namespace std;
int main(){
int n;
long long a[55];
cin>>n;
a[1]=1;
a[2]=2;
for(int i=3;i<=50;i++){
a[i]=a[i-1]+a[i-2];
}
while(n--){
int x,y;
cin>>x>>y;
cout<<a[y-x]<<endl;
}
return 0;
}