Submission #19402

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
19402	2016-02-24T11:17:58 Z	fredldh	Σ (kriii4_P2)	C++	100 / 100	8 ms	1084 KB

P2

#include<stdio.h>
#define M 1000000007
#define mod(a) ((a)%1000000007)
typedef long long int lld;
lld pow(lld a, lld x) {
    if(!x) return 1;
    lld P = pow(a, x/2);
    if(x&1) return mod(a*mod(P*P));
    return mod(P*P);
}
lld inv(lld a) {
    return pow(a, M-2);
}
lld div(lld a, lld b) {
    return mod(a*inv(b));
}
int main() {
    int n;
    scanf("%d", &n);
    lld res = 0;
    for(int i = 0; i < n; ++i) {
        int N, S;
        scanf("%d%d", &N, &S);
        res = mod(res+div(S, N));
    }
    printf("%lld\n", res);
    return 0;
}

Subtask #1

100.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	1084 KB	Output is correct
2	Correct	8 ms	1084 KB	Output is correct
3	Correct	0 ms	1084 KB	Output is correct
4	Correct	0 ms	1084 KB	Output is correct
5	Correct	0 ms	1084 KB	Output is correct
6	Correct	0 ms	1084 KB	Output is correct
7	Correct	0 ms	1084 KB	Output is correct
8	Correct	8 ms	1084 KB	Output is correct
9	Correct	0 ms	1084 KB	Output is correct
10	Correct	0 ms	1084 KB	Output is correct
11	Correct	7 ms	1084 KB	Output is correct
12	Correct	6 ms	1084 KB	Output is correct
13	Correct	5 ms	1084 KB	Output is correct
14	Correct	3 ms	1084 KB	Output is correct
15	Correct	4 ms	1084 KB	Output is correct
16	Correct	7 ms	1084 KB	Output is correct
17	Correct	0 ms	1084 KB	Output is correct
18	Correct	0 ms	1084 KB	Output is correct
19	Correct	8 ms	1084 KB	Output is correct
20	Correct	7 ms	1084 KB	Output is correct