Cod sursa(job #2849664)

Utilizator CiuiGinjoveanu Dragos Ciui Data 15 februarie 2022 14:08:05
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.65 kb
#include <iostream>
#include <fstream>
#include <string>
#include <cstring>
#include <algorithm>
#include <utility>
#include <cmath>
#include <map>
#include <deque>
#include <vector>
#include <set>
using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

const int MAX_SIZE = 1000005;
vector<int> list[MAX_SIZE];

int main() {
    int peaks, arrows, startPoint;
    fin >> peaks >> arrows >> startPoint;
    for (int i = 1; i <= arrows; ++i) {
        int start, end;
        fin >> start >> end;
        list[start].push_back(end);
    }
    for (int endPeak = 1; endPeak <= peaks; ++endPeak) {
        int moves = 0;
        deque<int> currentPositions;
        for (int j = 0; j < list[startPoint].size(); ++j) {
            currentPositions.push_back(list[startPoint][j]);
        }
        int ok = 1;
        int frq[MAX_SIZE] = {0};
        while (!currentPositions.empty() && ok) {
            int currentPoint = currentPositions.front();
            int size = list[currentPoint].size();
            for (int j = 0; j < size; ++j) {
                if (frq[list[currentPoint][j]] == 0) {
                    if (list[currentPoint][j] == endPeak) {
                        ok = 0;
                        break;
                    }
                    frq[list[currentPoint][j]] = 1;
                    currentPositions.push_back(list[currentPoint][j]);
                }
            }
            if (ok) {
                currentPositions.pop_front();
            }
            ++moves;
        }
        if (ok == 0) {
            fout << moves - 1 << " ";
        } else {
            fout << -1 << " ";
        }
    }
}
/*

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 */