Pagini recente » Cod sursa (job #2901369) | Cod sursa (job #80011) | Cod sursa (job #195018) | Cod sursa (job #945286) | Cod sursa (job #2176038)
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ll;
typedef pair < int , int > PII;
typedef pair < int , PII > PIPII;
int n, m, dist[50100];
PIPII M[250100];
struct cmp{
bool operator()(int a, int b){
return dist[a] > dist[b];
}
};
priority_queue < int, vector < int >, cmp > H;
vector < PII > V[50100];
bitset < 50100 > insideH;
void Bellman(int src){
H.push(src);
int pas = 0;
while (H.size() && pas <= n * m){
int x = H.top(); H.pop();
insideH[x] = 0;
for (auto it : V[x]){
if (dist[it.first] > dist[x] + it.second){
dist[it.first] = dist[x] + it.second;
if (insideH[it.first] == 0){
H.push(it.first);
insideH[it.first] = 1;
}
}
}
}
}
bool checker(){
for (int i = 1, x, y, c; i <= m; i++){
x = M[i].first; tie(y, c) = M[i].second;
if (dist[x] + c < dist[y])
return 1;
}
return 0;
}
int main(){
ifstream cin("bellmanford.in");
ofstream cout("bellmanford.out");
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n >> m;
for (int i = 1, x, y, c; i <= m; i++){
cin >> x >> y >> c;
V[x].push_back({y, c});
M[i] = {x, {y, c}};
}
for (int i = 2; i <= n; i++) dist[i] = 2e9;
Bellman(1);
if (checker()) return cout << "Ciclu negativ!", 0;
for (int i = 2; i <= n; i++)
cout << (dist[i] == 2e9 ? 0 : dist[i]) << " ";
return 0;
}