AC代码↓
#include<bits/stdc++.h>
using namespace std;
long long t,l,r;
int main(){
cin>>t;
while(t--){
cin>>l>>r;
cout<<((l+r)%2==0?(((l+r)/2)%9*(r-l+1)%9)%9:((l+r)%9*((r-l+1)/2)%9)%9)<<endl;
}
}
int128:70分代码(后面三个点wa了)
#include<bits/stdc++.h>
using namespace std;
__int128 n,l,r,k;
__int128 read() {
int X=0,w=1;
char ch=getchar();
while(ch<'0' || ch>'9') {if(ch=='-') w=-1;ch=getchar();}
while(ch>='0' && ch<='9') X=(X<<3)+(X<<1)+ch-'0',ch=getchar();
return X*w;
}
void print(__int128 x){if(x!=0)print(x/10);else return;putchar(x%10+'0');}
int main(){
n=read();
while(n--){
l=read(),r=read();
k=(l+r)%2==0?(((l+r)/2)%9*(r-l+1)%9)%9:k=((l+r)%9*((r-l+1)/2)%9)%9;
if(k==0)cout<<0;
else print(k);
cout<<endl;
}
}
能有OIer解答解答吗,Orz~