Pagini recente » Cod sursa (job #2589410) | Cod sursa (job #2885063) | Cod sursa (job #3281765) | Cod sursa (job #2552370) | Cod sursa (job #2589142)
#include <bits/stdc++.h>
#define N 50001
#define INF 0x3F3F3F3F
using namespace std;
bitset <N> enqueue;
vector <pair <int, int>> G[N];
array <int, N> dist, ct;
class cmp {
public:
bool operator () (const int &a, const int &b) {
return dist[a]>dist[b];
}
};
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;
}
};
class OutParser {
private:
FILE *fout;
char *buff;
int sp;
void write_ch(char ch) {
if (sp == 50000) {
fwrite(buff, 1, 50000, fout);
sp = 0;
buff[sp++] = ch;
} else {
buff[sp++] = ch;
}
}
public:
OutParser(const char* name) {
fout = fopen(name, "w");
buff = new char[50000]();
sp = 0;
}
~OutParser() {
fwrite(buff, 1, sp, fout);
fclose(fout);
}
OutParser& operator << (int vu32) {
if (vu32 < 0)
write_ch('-'),
vu32*=-1;
if (vu32 <= 9) {
write_ch(vu32 + '0');
} else {
(*this) << (vu32 / 10);
write_ch(vu32 % 10 + '0');
}
return *this;
}
OutParser& operator << (long long vu64) {
if (vu64 <= 9) {
write_ch(vu64 + '0');
} else {
(*this) << (vu64 / 10);
write_ch(vu64 % 10 + '0');
}
return *this;
}
OutParser& operator << (char ch) {
write_ch(ch);
return *this;
}
OutParser& operator << (const char *ch) {
while (*ch) {
write_ch(*ch);
++ch;
}
return *this;
}
};
int main () {
InParser fin ("bellmanford.in");
OutParser fout ("bellmanford.out");
ios::sync_with_stdio(false);
int n, m, i, j, c;
fin >> n >> m;
for (; m; m--) {
fin >> i >> j >> c;
G[i].push_back(make_pair(j, c));
}
bool stop=0;
dist.fill(INF);
priority_queue <int, vector <int>, cmp> Q;
Q.push(1);
enqueue[1]=ct[1]=1;
dist[1]=0;
while (!Q.empty() && !stop) {
auto save=Q.top();
Q.pop();
enqueue[save]=0;
for (auto it: G[save])
if (dist[it.first]>dist[save]+it.second) {
dist[it.first]=dist[save]+it.second;
if (!enqueue[it.first]) {
Q.push(it.first);
enqueue[it.first]=1;
ct[it.first]++;
if (ct[it.first]==n)
stop=1;
}
}
}
if (!stop)
for (i=2; i<=n; i++)
fout << dist[i] << ' ';
else
fout << "Ciclu negativ!";
return 0;
}