Submission #7802

#	Time	Username	Problem	Language	Result	Execution time	Memory
7802		gs_14069	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#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(b<4)puts("0");
    else{
        if(a<4)a=4;
        printf("%lld",f(a,b));
    }
}

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