Pagini recente » Cod sursa (job #2739340) | Cod sursa (job #1942716) | Cod sursa (job #1167782) | Cod sursa (job #1430292) | Cod sursa (job #2133473)
#include <iostream>
#include <fstream>
#include <bits/stdc++.h>
#define nmax 50003
using namespace std;
ifstream f ("dijkstra.in");
ofstream g ("dijkstra.out");
vector < pair < int,int > > v[nmax];
set < pair < int,int > > heap;
int INF = 0x3f3f3f3f , n, m ,i , j, x, y, c, next_x,next_c,d[nmax],l;
int main()
{
f >> n >> m;
for(i = 1;i <= m;i++)
{
f >> x >> y >> c;
v[x].push_back({y,c});
}
memset(d,INF,sizeof(d));
d[1] = 0;
heap.insert({0,1});
while(not heap.empty())
{
c = heap.begin() -> first;
x = heap.begin() -> second;
heap.erase(heap.begin());
l = v[x].size();
for(i = 0;i < l;i++)
{
next_x = v[x][i].first;
next_c = v[x][i].second;
if(d[next_x] > next_c + c)
{
if(d[next_x] != INF)
heap.erase(heap.find({d[next_x],next_x}));
d[next_x] = next_c + c;
heap.insert({d[next_x],next_x});
}
}
}
for(i = 2;i <= n;i++)
{
if(d[i] == INF)
g << "0 ";
else g << d[i] << " ";
}
return 0;
}