Propagatio.cc
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	#include <iostream>
	#include <vector>
	using namespace std;


	const string P1("P1 missing or incorrect");
	const string WRONG_NB_COL_LGN("Nb columns and/or nb lines incorrect");
	const string MATRIX_SQUARE("Matrix is not square");
	const string IRREGULAR_CONTENT("Matrix description with incorrect content");
	const string DISCONNECTED_GRAPH("Matrix corresponds to a disconnected graph");


	void check_bpm(int &n);
	void check_bpm(int &n) {
	string header;
	// cout << "Header P1 ?" << endl;
	cin >> header;
	if (header != "P1") {
	cout << P1 << endl;
	exit(0);
	}

	int c,l;
	// cout << "Nombre de colonnes ?" << endl;
	cin >> c;
	// cout << "Nombre de lignes ?" << endl;
	cin >> l;
	if (l == c)
	n=l;
	else {
	cout << MATRIX_SQUARE << endl;
	exit(0);
	}

	}


	void make_adj(int n,vector<vector<bool>> &tab);
	void make_adj(int n,vector<vector<bool>> &tab) {
	for (int i(0); i < n; i++) {
	char c;
	int j(0);
	cin >> c;
	while(c != '\n') {
	if (c == '0' \|\| c == '1') {
	tab[i][j]=int(c)-int('0');
	j++;
	} else if (isspace(c)) {
	} else {
	cout << IRREGULAR_CONTENT << endl;
	exit(0);
	}
	cin.get(c);
	}
	if (j != n) {
	cout << WRONG_NB_COL_LGN << endl;
	exit(0);
	}
	tab[i][i]=0;
	}
	for (int i(0); i < n; i++) {
	for (int j(0); j < n; j++) {
	if (tab[i][j] == 1)
	tab[j][i]=1;
	}
	}
	}


	int main() {
	int n;
	check_bpm(n);
	vector<vector<bool>> matAdj(n, vector<bool>(n));
	make_adj(n,matAdj);

	for (int i(0); i < n; i++) {
	for (int j(0); j < n; j++) {
	cout << matAdj[i][j] << " ";
	}
	cout << endl;
	}

	return 0;
	}