Submission #2892

#	Time	Username	Problem	Language	Result	Execution time	Memory
2892		kipa00	다각형 (GA5_polygon)	C++98	100 / 100	0 ms	1088 KiB

polygon

#include <cstdio>

long long int sums(int c) {
    long long int res = c / 2;
    res *= (res + 1);
    if (c >= 2) res -= 2;
    return res;
}

int main() {
    int a, b;
    scanf("%d %d", &a, &b);
    printf("%lld\n", sums(b) - sums(a - 1));
    return 0;
}

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