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Budget.java
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Budget.java
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// https://www.acmicpc.net/problem/2512
package Baekjoon.TwoPointers;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Budget {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int N = Integer.parseInt(br.readLine());
int[] arr = new int[N];
StringTokenizer st = new StringTokenizer(br.readLine());
int maxB = 0;
int tempSum = 0;
for(int i = 0; i<N;i++){
tempSum+=arr[i]= Integer.parseInt(st.nextToken());
maxB = Math.max(maxB, arr[i]);
}
int M = Integer.parseInt(br.readLine());
// 입력 완료
if(tempSum<=M){
System.out.println(maxB);
return;
}
int l = 1; // 1로 해야 함
int r = maxB;
// l < r X
while(l <= r){
int sum = 0;
int m = (l+r)/2;
for(int i = 0 ; i<N ; i++){
if(arr[i]-m > 0){
sum+=m;
}else{
sum+=arr[i];
}
}
// 왜 각각 m+1, m-1 ? r = m X ?
if(sum <= M){
l = m+1;
}else{
r = m-1;
}
System.out.println("l = " + l+", r = " + r+", m = " + m);
}
System.out.println(r);
}
}