Pagini recente » Cod sursa (job #151856) | Istoria paginii runda/antrenament-de-primavara/clasament | Egyptian Fractions | Istoria paginii runda/usu2/clasament | Cod sursa (job #2454966)
#include<bits/stdc++.h>
#define fi first
#define sc second
using namespace std;
#include <stdio.h>
#include <ctype.h>
class InParser {
private:
FILE *fin;
char *buff;
int sp;
char read_ch() {
++sp;
if (sp == 4096) {
sp = 0;
fread(buff, 1, 4096, fin);
}
return buff[sp];
}
public:
InParser(const char* nume) {
fin = fopen(nume, "r");
buff = new char[4096]();
sp = 4095;
}
InParser& operator >> (int &n) {
char c;
while (!isdigit(c = read_ch()) && c != '-');
int sgn = 1;
if (c == '-') {
n = 0;
sgn = -1;
} else {
n = c - '0';
}
while (isdigit(c = read_ch())) {
n = 10 * n + c - '0';
}
n *= sgn;
return *this;
}
InParser& operator >> (long long &n) {
char c;
n = 0;
while (!isdigit(c = read_ch()) && c != '-');
long long sgn = 1;
if (c == '-') {
n = 0;
sgn = -1;
} else {
n = c - '0';
}
while (isdigit(c = read_ch())) {
n = 10 * n + c - '0';
}
n *= sgn;
return *this;
}
} f("dijkstra.in");
ofstream g("dijkstra.out");
int n, m, dis[200001];
vector<pair<int, int>>v[200001];
set<pair<int, int>>s;
bool viz[200001];
void dijkstra(int nod)
{
viz[nod]=1;
for(int i=0; i<v[nod].size(); i++)
{
if(!viz[v[nod][i].fi])
{
viz[v[nod][i].fi]=1;
s.insert(make_pair(v[nod][i].fi, dis[nod]+v[nod][i].sc));
dis[v[nod][i].fi]=dis[nod]+v[nod][i].sc;
}
else
{
if(v[nod][i].sc+dis[nod]<dis[v[nod][i].fi])
{
s.erase(make_pair(v[nod][i].fi, dis[v[nod][i].fi]));
s.insert(make_pair(v[nod][i].fi, dis[nod]+v[nod][i].sc));
dis[v[nod][i].fi]=dis[nod]+v[nod][i].sc;
}
}
}
}
int main()
{
f>>n>>m;
for(int i=1; i<=m; i++)
{
int x, y, cost;
f>>x>>y>>cost;
v[x].push_back(make_pair(y, cost));
}
s.insert(make_pair(1, 0));
while(!s.empty())
{
int x=(*s.begin()).fi;
s.erase(s.begin());
dijkstra(x);
}
for(int i=2; i<=n; i++)
g<<dis[i]<<' ';
return 0;
}