# | TimeUTC-0 | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
7796 | gs_14069 | 다각형 (GA5_polygon) | C++98 | 0 ms | 1088 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<cstdio>
long long a,b;
long long f(long long s,long long t){
long long n=(t-s)/2+1;
return n*(s+t)/2;
}
int main(){
scanf("%lld%lld",&a,&b);
if(a%2)a++;
if(b%2)b--;
if(a<4)a=4;
printf("%lld",f(a,b));
}
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