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- #include <bits/stdc++.h>
- using namespace std;
- const int inf = 1e9 + 10;
- int main()
- {
- int n, s, t;
- cin >> n >> s >> t;
- s--; t--;
- int d[n][n];
- for (int i = 0; i < n ;i++)
- for (int j = 0; j < n ;j++)
- {
- cin >> d[i][j];
- if (d[i][j] < 0)
- d[i][j] = inf;
- }
- for (int k = 0; k < n ;k++)
- for (int i = 0; i < n ;i++)
- for (int j = 0; j < n ;j++)
- d[i][j] = min (d[i][j], d[i][k] + d[k][j]);
- if (d[s][t] < inf)
- {
- cout << d[s][t];
- return 0;
- }
- else
- {
- cout << -1;
- return 0;
- }
- return 0;
- }
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