Submission #2799

#TimeUsernameProblemLanguageResultExecution timeMemory
2799kk1401다각형 (GA5_polygon)C++98
0 / 100
0 ms1088 KiB
#include<stdio.h> long long f(long long k) { if(k==1) return 2; if(k%2ll==1ll) k--; int kk=k/2ll; return kk*(kk+1ll); } int main() { long long a,b; scanf("%lld%lld",&a,&b); printf("%lld",f(b)-f(a-1)); return 0; }
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