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Cod sursa(job #989172)
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <fstream>
using namespace std;
const string file = "bellmanford";
const string infile = file + ".in";
const string outfile = file + ".out";
int N, M;
vector<vector<pair<int, int> > > G;
vector<int> dst;
bool bellman()
{
dst.resize(N + 1, 0x3f3f3f3f);
dst[1] = 0;
vector<bool> inQ(N + 1);
vector<int> qCount(N + 1);
queue<int> q;
q.push(1);
inQ[1] = true;
while(q.empty() == false)
{
int current = q.front();
q.pop();
inQ[current] = false;
for(vector<pair<int, int> >::iterator itr = G[current].begin();
itr != G[current].end();
itr++)
{
if(dst[itr->first] > dst[current] + itr->second)
{
dst[itr->first] = dst[current] + itr->second;
if(inQ[itr->first] == false)
{
q.push(itr->first);
inQ[itr->first] = true;
qCount[itr->first] ++;
if(qCount[itr->first] == N) return false;
}
}
}
}
return true;
}
int main()
{
fstream fin(infile.c_str(), ios::in);
fin >> N >> M;
G.resize( N + 1);
for(int i = 0; i < M; i++)
{
int x, y, c;
fin >> x >> y >> c;
G[x].push_back(make_pair(y, c));
}
fin.close();
fstream fout(outfile.c_str(), ios::out);
if(bellman())
{
for(int i = 2; i <= N; i++)
{
fout << dst[i]<< " ";
}
}
else
{
fout << "Ciclu negativ!";
}
fout.close();
}