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[백준] 2513번 통학버스 #33
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풀이 언어
코드import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int n = Integer.parseInt(st.nextToken());
int k = Integer.parseInt(st.nextToken());
int s = Integer.parseInt(st.nextToken());
int[] board = new int[100001];
int min = 100000;
int max = 0;
for (int i = 0; i < n; i++) {
st = new StringTokenizer(br.readLine());
int pos = Integer.parseInt(st.nextToken());
min = Math.min(min, pos);
max = Math.max(max, pos);
int count = Integer.parseInt(st.nextToken());
board[pos] = count;
}
int result = 0;
int count = 0;
while (min <= s) {
if(count == 0 && board[min] != 0) {
result += (s - min) * 2;
}
if(board[min] == 0) {
min++;
continue;
}
if(count + board[min] >= k) {
board[min] -= k - count;
count = 0;
} else {
count += board[min];
board[min] = 0;
}
}
count = 0;
while (max >= s) {
if(board[max] == 0) {
max--;
continue;
}
if(count == 0 && board[max] != 0) {
result += (max - s) * 2;
}
if(count + board[max] >= k) {
board[max] -= k - count;
count = 0;
} else {
count += board[max];
board[max] = 0;
}
}
System.out.println(result);
}
} 핵심 로직 혹은 자료구조
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통학버스
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