Submission #7796

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
77962014-08-19 10:16:24gs_14069다각형 (GA5_polygon)C++98
0 / 100
0 ms1088 KiB
#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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