Submission #7782

#	Time	Username	Problem	Language	Result	Execution time	Memory
7782		gs14004	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#include <cstdio>

long long f(long long p){
    if(p<4) return 0;
    p >>= 1;
    long long res = p*(p+1)/2;
    return res-1;
}

int main(){
    long long s,e;
    scanf("%lld %lld",&s,&e);
    printf("%lld",2*(f(e)-f(s-1)));
}

• Subtask 1: 60 / 60
• Subtask 2: 10 / 10
• Subtask 3: 30 / 30