#include <algorithm>
#include <iostream>
#include <cstdio>
using namespace std;
long long h[100005];
long long f[100005], m = 1000000007, nn[100005], tw[100005];
int main()
{
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
int n;
scanf("%d", &n);
for(int i = 0; i < n; i++) scanf("%lld", &h[i]);
f[1] = 1;
for(int i = 2; i < 100005; i++) { f[i] = f[i - 1] * i; f[i] %= m; }
tw[1] = 2;
for(int i = 2; i < 100005; i++) { tw[i] = tw[i - 1] * 2; tw[i] %= m; }
if(n == 1) { printf("0\n"); printf("1"); }
else if(n == 2) { printf("%lld\n", h[0] * h[1]); printf("2"); }
else {
//sort(h, h + n);
long long a = h[0] + h[1];
long long b = h[0] * h[1];
long long c, d;//, m = 1000000007;
for(int i = 2; i < n; i++) {
/*c = a + h[i];
d = ((a % m) * h[i]) % m; //d %= ;
a = c;
b = ((b % m) + (d % m)) % m; //b %= 1000000007;*/
c = a * h[i]; //c %= m;
a += h[i]; b += c; //b %= m;
}
printf("%lld\n", b);
printf("%lld", (f[n] * tw[n - 2]) % m);
}
//printf("-1");
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
0 ms |
4792 KB |
open (syscall #2) was called by the program (disallowed syscall) |
| 2 |
Halted |
0 ms |
0 KB |
- |
