Submission #2889

#	Time	Username	Problem	Language	Result	Execution time	Memory
2889		tncks0121	다각형 (GA5_polygon)	C++98	0 / 100	0 ms	1088 KiB

polygon

#include <cstdio>

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

int main() {
    int a, b;
    long long int res;
    scanf("%d %d", &a, &b);
    res = sums(b) - sums(a-1);
    if (a < 2 && b >= 2) {
        res -= 2;
    }
    printf("%lld\n", res);
    return 0;
}

• Subtask 1: 0 / 60
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30