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JY_42884.java

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import java.util.*;

class JY_42884 {

public int solution(int[][] routes) {

int answer = 0;

Arrays.sort(routes, (o1, o2)->o1[1]-o2[1]);

int last = -30001;

for(int [] route: routes) {

if(route[0] > last) {

answer++;

last = route[1];

}

}

return answer;

}

}