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  1. #include <stdio.h>
  2.  
  3. #define swap(x, y) (x ^= y, y ^= x, x ^= y)
  4.  
  5. const int MOD = 1000000007;
  6.  
  7. int n, ar[100010], lim[100010];
  8.  
  9. int bigmod(int x, unsigned long long int n){
  10.     if (!n) return 1;
  11.     if (n == 1) return (x);
  12.     unsigned long long int res = bigmod(x, n / 2);
  13.     res = (res * res) % MOD;
  14.     if (n % 2) res = (res * x) % MOD;
  15.     return (res);
  16. }
  17.  
  18. int main(){
  19.     int i, j;
  20.  
  21.     while (scanf("%d", &n) != EOF){
  22.         for (i = 0; i < n; i++){
  23.             scanf("%d", &ar[i]);
  24.             lim[i] = n;
  25.         }
  26.  
  27.         unsigned long long int res = 1;
  28.         for (i = 0; i < n; i++){
  29.             if (lim[i] > i){
  30.                 int c, d, x, y, counter = 0;
  31.                 for (j = i; j < lim[i]; j++){
  32.                     if (i == j) x = y = ar[j], c = d = j;
  33.                     if (ar[j] < x) x = ar[j], c = j;
  34.                     if (ar[j] > y) y = ar[j], d = j;
  35.                     if (i != j) res = (res * (y - x)) % MOD;
  36.                     counter++;
  37.                 }
  38.  
  39.                 if (counter < 2) continue;
  40.                 if (c > d) swap(c, d);
  41.  
  42.                 unsigned long long int p = 0, q = 0, z = 0;
  43.                 p = (lim[i] - d);
  44.                 q = (c - i);
  45.                 z = (p * q);
  46.                 res = (res * (bigmod(y - x, z))) % MOD;
  47.                 for (j = i + 1; j <= c; j++) lim[j] = d;
  48.             }
  49.         }
  50.  
  51.         printf("%llu\n", res);
  52.     }
  53.     return 0;
  54. }
Success #stdin #stdout 0.01s 2456KB
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https://ideone.com/kUui3D
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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