Submission #9454

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
9454	2014-09-28T06:33:42 Z	lemonsqueeze	Xtreme gcd sum (kriii2_X)	C++	1 / 4	4000 ms	16868 KB

X

#include <cstdio>

const int N = 10000;
const int NUMERIC = 2000000;
typedef long long int64;

const int64 MOD = 1000000007;

int n;
int64 a[N], b[N], d[NUMERIC];

int main(void) {
	scanf("%d", &n);
	for (int i = 0; i < n; i++)
		scanf("%lld %lld", &a[i], &b[i]);
	for (int i = 1000000; i >= 1; i--) {
		int64 cnt = 1;
		for (int j = 0; j < n; j++) {
			int bdiv = b[j] / i;
			int adiv = (a[j] - 1) / i;
			int64 tmpcnt = (bdiv - adiv);
			cnt = (cnt * tmpcnt) % MOD;
		}
		d[i] = cnt;
		for (int j = i + i; j <= 1000000; j+=i) {
			d[i] = (d[i] - d[j] + MOD) % MOD;
		}
	}
	int64 ans = 0;
	for (int i = 1; i <= 1000000; i++) {
		ans += (int64) i * d[i];
		ans = ans % MOD;
	}
	printf("%lld\n", ans);
	return 0;
}

Subtask #1

1.0 / 1.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	192 ms	16868 KB	Output is correct
2	Correct	192 ms	16868 KB	Output is correct
3	Correct	188 ms	16868 KB	Output is correct
4	Correct	212 ms	16868 KB	Output is correct
5	Correct	212 ms	16868 KB	Output is correct
6	Correct	216 ms	16868 KB	Output is correct
7	Correct	244 ms	16868 KB	Output is correct
8	Correct	252 ms	16868 KB	Output is correct
9	Correct	260 ms	16868 KB	Output is correct
10	Correct	248 ms	16868 KB	Output is correct
11	Correct	428 ms	16868 KB	Output is correct
12	Correct	432 ms	16868 KB	Output is correct
13	Correct	436 ms	16868 KB	Output is correct
14	Correct	428 ms	16868 KB	Output is correct
15	Correct	432 ms	16868 KB	Output is correct
16	Correct	432 ms	16868 KB	Output is correct
17	Correct	424 ms	16868 KB	Output is correct
18	Correct	432 ms	16868 KB	Output is correct
19	Correct	432 ms	16868 KB	Output is correct
20	Correct	432 ms	16868 KB	Output is correct
21	Correct	432 ms	16868 KB	Output is correct
22	Correct	428 ms	16868 KB	Output is correct
23	Correct	428 ms	16868 KB	Output is correct
24	Correct	436 ms	16868 KB	Output is correct
25	Correct	432 ms	16868 KB	Output is correct

Subtask #2

0.0 / 3.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3128 ms	16868 KB	Output is correct
2	Correct	3124 ms	16868 KB	Output is correct
3	Correct	3124 ms	16868 KB	Output is correct
4	Correct	3140 ms	16868 KB	Output is correct
5	Correct	3132 ms	16868 KB	Output is correct
6	Correct	3120 ms	16868 KB	Output is correct
7	Correct	3120 ms	16868 KB	Output is correct
8	Correct	3136 ms	16868 KB	Output is correct
9	Correct	3136 ms	16868 KB	Output is correct
10	Correct	3136 ms	16868 KB	Output is correct
11	Execution timed out	4000 ms	16864 KB	Program timed out
12	Halted	0 ms	0 KB	-