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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. void Swap(long *a, long *b)
  5. {
  6.     long temp = *a;
  7.     *a = *b;
  8.     *b = temp;
  9. }
  10.  
  11. long Partition(long *arr, long start, long end, long *u, long *v)
  12. {
  13.     long pivot = arr[end];
  14.     long pIndex = start;
  15.     long i;
  16.     for(i = start; i<end; i++) {
  17.         if(arr[i] <= pivot) {
  18.         Swap(arr+i, arr+pIndex);
  19.         Swap(u+i, u+pIndex);
  20.         Swap(v+i, v+pIndex);
  21.         pIndex++;
  22.         }
  23.     }
  24.     Swap(arr+pIndex, arr+end);
  25.     Swap(u+pIndex, u+end);
  26.     Swap(v+pIndex, v+end);
  27.     return pIndex;
  28. }
  29.  
  30. void MSort(long *u, long *v, long *arr, long start, long end)
  31. {
  32.     if(start < end) {
  33.         long pIndex = Partition(arr, start, end, u, v);
  34.         MSort(u, v, arr, start, pIndex-1);
  35.         MSort(u, v, arr, pIndex+1, end);
  36.     }
  37. }
  38.  
  39. int main()
  40. {
  41.     long n, m, k;
  42.     cin >> n >> m >> k;
  43.     long i;
  44.     long u[m], v[m], l[m];
  45.     for(i = 0; i < m; i++) {
  46.         cin >> u[i] >> v[i] >> l[i];
  47.     }
  48.     if(k == 0 || k == n) {
  49.         cout << "-1";
  50.     }
  51.     else {
  52.         long arr[k];
  53.         long u1[m] = {0}, v1[m] = {0}, l1[m] = {-1};
  54.         for(i = 0; i < k; i++)
  55.             cin >> arr[i];
  56.         long x = 0, j;
  57.         for(j = 0; j < k; j++) {
  58.             for(i = 0; i < m; i++) {
  59.                 if(arr[j] == u[i]) {
  60.                     u1[x] = u[i];
  61.                     v1[x] = v[i];
  62.                     l1[x] = l[i];
  63.                     x++;
  64.                 } else if(arr[j] == v[i]) {
  65.                     u1[x] = v[i];
  66.                     v1[x] = u[i];
  67.                     l1[x] = l[i];
  68.                     x++;
  69.                 }
  70.             }
  71.         }
  72.         MSort(u1, v1, l1, 0, x-1);
  73.  
  74.         long flag = 1;
  75.         for(i = 0; i < x; i++) {
  76.             flag = 0;
  77.             for(j = 0; j < k; j++) {
  78.                 //cout << v1[i] << " " << arr[j] << " " << endl;
  79.                 if(v1[i] == arr[j]) {
  80.                     flag = 1;
  81.                     break;
  82.                 }
  83.             }
  84.             if(flag == 0) {
  85.                 //cout << i << " ";
  86.                 cout << l1[i];
  87.                 break;
  88.             }
  89.         }
  90.         if(flag == 1)
  91.             cout << -1;
  92.     }
  93.     return 0;
  94. }
Runtime error #stdin #stdout 0s 3468KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/fOzg7O
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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