Untitled

Map Coloring

*** code ***
#include<iostream>
using namespace std;
#define MAX_SIZE 1000
#define MAX_N 1500

int N, E; // N:so nut   E:so canh
int map[MAX_N][MAX_N]; // ma tran ke

/* Queue */
int qx[MAX_N];
int front = -1;
int rear = -1;
void push(int x){
	rear++;
	qx[rear] = x;
}
void pop(){
	front++;
}
bool isEmpty(){
	return front == rear;
}
int sizeQueue(){
	return rear - front;
}

bool visit[MAX_N];
int color[MAX_N];

/* Breadth First Search */
void BFS(int x){
	// 1. visit n push
	visit[x] = true;
	push(x);
	color[x] = 0;
	int colorI = 0;
	// 2. while |=> pop -> for|=> visit n push
	while(!isEmpty()){
		pop();
		int x1 = qx[front];
		colorI = 1 - colorI;
		for (int i = 1; i <= N; i++){
			if(map[x1][i] == 1){
				if(visit[i] == true && color[i] != colorI){
					color[0] = -1;
					return;
				} 
				visit[i] = true;
				push(i);
				color[i] = colorI;
			}
		}
	}
}

void reset(){
	// reset queue
	front = -1;
	rear = -1;
	// reset visit and colors
	for (int i = 0; i <= N; i++){
		visit[i] = false;
		color[i] = 0;
	}
	// reset map init
	for (int i = 0; i <= N; i++){
		for (int j = 0; j <=N; j++){
			map[i][j] = 0;
		}
	}
}

/* main */
int main(){
	freopen("input.txt", "r" , stdin);
	int TC; cin >> TC;
	for (int tc = 1; tc <= TC; tc++){
		reset();
		/* Input */ 
		cin >> N >> E;
		for (int i = 1; i <= E; i++){
			int x, y;
			cin >> x >> y;
			map[x][y] = 1;
		}

		/* Program */		
		BFS(1);

		/* Output */
		cout << "#" << tc << " ";

		if (color[0] != -1) {
			for (int o = 1; o <= N; o++){
				cout << color[o];
			}
		}
		else cout << -1;
		cout << endl;
		
	}
}
*** output ***
#1 -1
#2 -1
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