Submission #7780

#TimeUsernameProblemLanguageResultExecution timeMemory
7780gs13023다각형 (GA5_polygon)C++98
0 / 100
0 ms1088 KiB
#include<cstdio> long long f(int n) { int t=n/2; return t*(t+1); } int main() { int a,b; scanf("%d%d",&a,&b); printf("%lld",f(b)-f(a-1)); }
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