Hello_Java/J1766.java at master · cod0216/Hello_Java · GitHub

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importjava.io.BufferedReader;
importjava.io.IOException;
importjava.io.InputStreamReader;
importjava.util.ArrayList;
importjava.util.PriorityQueue;

publicclassJ1766 {

staticintn, m, countArr[];
staticArrayList<Integer>[] list;

publicstaticvoidmain(String[] args) throwsIOException {
BufferedReaderbuffer = newBufferedReader(newInputStreamReader(System.in));
String[] input = buffer.readLine().split(" ");

n = Integer.parseInt(input[0]);
m = Integer.parseInt(input[1]);
list = newArrayList[n+1];
countArr = newint[n+1];

for(inti = 0; i <=n; i++){
list[i] = newArrayList<>();
 }

for(inti = 0; i< m; i++){
input = buffer.readLine().split(" ");
intstart = Integer.parseInt(input[0]);
intend = Integer.parseInt(input[1]);

list[start].add(end);
countArr[end]++;
 }

polo();
 }

publicstaticvoidpolo(){
PriorityQueue<Integer> pq = newPriorityQueue<>();
for(inti = 1; i <= n; i++){
if(countArr[i] ==0){
pq.offer(i);
 }
 }

while(!pq.isEmpty()){
intcur = pq.poll();
System.out.print(cur+ " ");

for(intnow : list[cur]){
countArr[now]--;
if(countArr[now] ==0){
pq.offer(now);
 }
 }
 }
 }

}