Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- /*
- ⠸⣷⣦⠤⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣠⣤⠀⠀⠀
- ⠀⠙⣿⡄⠈⠑⢄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⠔⠊⠉⣿⡿⠁⠀⠀⠀
- ⠀⠀⠈⠣⡀⠀⠀⠑⢄⠀⠀⠀⠀⠀⠀⠀⠀⠀⡠⠊⠁⠀⠀⣰⠟⠀⠀⠀⣀⣀
- ⠀⠀⠀⠀⠈⠢⣄⠀⡈⠒⠊⠉⠁⠀⠈⠉⠑⠚⠀⠀⣀⠔⢊⣠⠤⠒⠊⠉⡜
- ⠀⠀⠀⠀⠀⠀⠀⡽⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠩⡔⠊⠁⠀⠀⠀⠀⠀ ⠀⠇
- ⠀⠀⠀⠀⠀⠀⠀⡇⢠⡤⢄⠀⠀⠀⠀⠀⡠⢤⣄⠀⡇⠀⠀⠀⠀⠀⠀⠀ ⢰⠀
- ⠀⠀⠀⠀⠀⠀⢀⠇⠹⠿⠟⠀⠀⠤⠀⠀⠻⠿⠟⠀⣇⠀⠀⡀⠠⠄⠒⠊⠁⠀
- ⠀⠀⠀⠀⠀⠀⢸⣿⣿⡆⠀⠰⠤⠖⠦⠴⠀⢀⣶⣿⣿⠀⠙⢄⠀⠀⠀⠀⠀⠀
- ⠀⠀⠀⠀⠀⠀⠀⢻⣿⠃⠀⠀⠀⠀⠀⠀⠀⠈⠿⡿⠛⢄⠀⠀⠱⣄⠀⠀⠀⠀
- ⠀⠀⠀⠀⠀⠀⠀⢸⠈⠓⠦⠀⣀⣀⣀⠀⡠⠴⠊⠹⡞⣁⠤⠒⠉⠀⠀⠀⠀⠀
- ⠀⠀⠀⠀⠀⠀⣠⠃⠀⠀⠀⠀⡌⠉⠉⡤⠀⠀⠀⠀⢻⠿⠆⠀⠀⠀⠀⠀⠀⠀
- ⠀⠀⠀⠀⠀⠰⠁⡀⠀⠀⠀⠀⢸⠀⢰⠃⠀⠀⠀⢠⠀⢣⠀⠀⠀⠀⠀⠀⠀⠀
- ⠀⠀⠀⢶⣗⠧⡀⢳⠀⠀⠀⠀⢸⣀⣸⠀⠀⠀⢀⡜⠀⣸⢤⣶⠀⠀⠀⠀⠀⠀
- ⠀⠀⠀⠈⠻⣿⣦⣈⣧⡀⠀⠀⢸⣿⣿⠀⠀⢀⣼⡀⣨⣿⡿⠁⠀⠀⠀⠀⠀⠀
- ⠀⠀⠀⠀⠀⠈⠻⠿⠿⠓⠄⠤⠘⠉⠙⠤⢀⠾⠿⣿⠟⠋
- */
- #include <iostream>
- #include <string>
- #include <sstream>
- #include <vector>
- #include <cmath>
- #include <algorithm>
- #include <memory.h>
- #include <stdio.h>
- #include <stack>
- #include <deque>
- #include <queue>
- #include <set>
- #include <iterator>
- #include <map>
- #include <iomanip>
- #include <unordered_set>
- #define int long long
- #define pb push_back
- #define double long double
- #define endl "\n"
- #define fir first
- #define sec second
- #define un unsigned
- #define INF 1000000009
- #define pii pair<int, int>
- #define all(v) v.begin(), v.end()
- using namespace std;
- const int N = 1000009;
- signed main()
- {
- ios_base::sync_with_stdio(false);
- cin.tie(0);
- cout.tie(0);
- int n, s, f;
- cin >> n >> s >> f;
- vector<vector<pii>> gr(n + 1);
- for (int i = 0; i < n; i++)
- {
- for (int j = 0; j < n; j++)
- {
- int a;
- cin >> a;
- if (a != -1)
- {
- gr[i + 1].push_back({ j + 1, a });
- }
- }
- }
- vector<int> dist(n + 1, INF);
- dist[s] = 0;
- set<pii> q;
- q.insert({ dist[s], s });
- while (!q.empty())
- {
- int v = (*q.begin()).second;
- q.erase(q.begin());
- for (int i = 0; i < gr[v].size(); i++)
- {
- int to = gr[v][i].first;
- int len = gr[v][i].second;
- if (dist[v] + len < dist[to])
- {
- q.erase({ dist[to],to });
- dist[to] = dist[v] + len;
- q.insert({ dist[to],to });
- }
- }
- }
- if (dist[f] == INF)
- {
- cout << -1;
- }
- else
- {
- cout << dist[f];
- }
- return 0;
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement