Cod sursa(job #2761466)

Utilizator VanillaSoltan Marian Vanilla Data 2 iulie 2021 11:15:25
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 2.34 kb
#include <bits/stdc++.h>
#include <fstream>
using namespace std;
typedef long long int64;
typedef vector<int> vec;
typedef vector<int64> vec64;
    string __fname = "bellmanford";
    ifstream in (__fname + ".in");
    ofstream out (__fname + ".out");
    #define cin in
    #define cout out
#define pii pair <int, int> 
#define pii64 pair <int64, int64>
#define ss cout << " ";
#define nn cout << "\n";
#define ct(x) cout << x;
#define cts(x) cout << x << " ";
#define ctn(x) cout << x << "\n";
#define db(x) cout << "> " << #x << ": " << x << "\n";
#define qr queries();
void solve(int);
void queries(){int n;cin >> n;for (int i = 1; i <= n; i++) solve(i);}
int64 ceildiv(int64 a, int64 b) {return a / b + !!(a % b);}
template<class T>T gcd (T a, T b){return (b ? gcd(b, a % b): a);}
template<class T>T lcm (T a, T b){return a * b / gcd(a, b);}
// // // // // // // // // // // // // // // // // // // // // // 
/*                  TEMPLATE - VANILLA                         */
// // // // // // // // // // // // // // // // // // // // // //
const int maxn = 200200;
const int64 mod = 1000000007;
const double pi = 3.14159265359;
const int ddx[] = {-1, -1, 0, 1, 1, 1, 0, -1};
const int ddy[] = {0, 1, 1, 1, 0, -1, -1, -1};
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};

void solve(int id){
    
    return;
}


int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n,m;
    cin >> n >> m;
    vector <pii> vr[50001];
    vector <int> p (n, 1e9);
    for (int i = 0; i < m; i++){
        int x,y,val;
        cin >> x >> y >> val;
        x--;
        y--;
        vr[x].push_back({y, val});
    }
    queue <int> q;
    vector <bool> inq (n, 0);
    vector <int> rel (n);
    p[0] = 0;
    inq[0] = 1;
    q.push(0);
    while (!q.empty()) {
        int u = q.front();
        q.pop();
        inq[u] = 0;
        for (auto node: vr[u]) {
            int v = node.first;
            int cost = node.second;
            if (p[u] + cost < p[v]) {
                p[v] = p[u] + cost;
                if (!inq[v]) {
                    q.push(v);
                    inq[v] = 1;
                    rel[v]++;
                    if (rel[v] > n) {
                        ctn("Ciclu negativ!");
                        return 0;
                    }
                }
            }
        }
    }
    for (int i = 1; i < n; i++){
        cts(p[i]);
    }
    return 0;
}