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- #include<iostream>
- using namespace std;
- class Graph
- {
- private:
- bool orient;
- int n, **arr, shet_reber, *d;
- public:
- Graph (int **matrix, int x, int shet)
- {
- n = x;
- arr = matrix;
- shet_reber = shet;
- d = new int[n];
- }
- void minpath(int x);
- int get_length_path(int x, int y);
- };
- void Graph::minpath(int x)
- {
- int w, min, j;
- bool *old = new bool[n];
- int *path = new int[n];
- for ( int i = 0; i < n; i++)
- {
- d[i] = arr[x][i];
- old[i] = false;
- path[i] = x;
- }
- old[x] = true;
- for (int i = 1; i < n; i++)
- {
- for ( w = -1, min = INT8_MAX, j = 0; j < n; j++)
- if (!old[j] && d[j] < min)
- {
- w = j;
- min = d[j];
- }
- if (w < 0)
- break;
- for (old[w] = true, j = 0; j < n; j++)
- if (!old[j] && d[j] > d[w] + arr[w][j])
- {
- d[j] = d[w] + arr[w][j];
- path[j] = w;
- }
- }
- delete [] old;
- }
- int Graph::get_length_path(int x, int y)
- {
- int dlina = 0;
- minpath(x);
- int i = y;
- if ( d[i] == INT8_MAX)
- dlina = -1;
- else dlina = d[i];
- return dlina;
- }
- int main()
- {
- int n, shet_reber = 0, x, y;
- cin >> n >> x >> y;
- int **arr = new int*[n];
- for ( int i = 0; i < n; i++)
- arr[i] = new int[n];
- for (int i = 0; i < n; i++)
- for (int j = 0; j < n; j++)
- {
- cin >> arr[i][j];
- if (arr[i][j] != 0)
- shet_reber++;
- }
- Graph object(arr, n, shet_reber);
- cout << object.get_length_path(x-1, y-1);
- }
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