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MonkeyAndBamboo.java
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MonkeyAndBamboo.java
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/**
* https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=3183
* #binary-search
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class MonkeyAndBamboo {
public static boolean validEnergy(int[] arr, int val) {
for (int i = 1; i < arr.length; i++) {
if ((arr[i] - arr[i - 1]) > val) {
return false;
} else if (arr[i] - arr[i - 1] == val) {
val--;
}
}
return true;
}
public static void main(String[] args) throws IOException {
MyScanner sc = new MyScanner(System.in);
int testcases = sc.nextInt();
int n, tmp;
for (int t = 1; t < testcases + 1; t++) {
n = sc.nextInt();
int[] arr = new int[n + 1];
for (int i = 1; i < n + 1; i++) {
tmp = sc.nextInt();
arr[i] = tmp;
}
int left = arr[0]; // all value that is before arr[0] is invalid
int right = arr[n];
int mid;
int ret = arr[0];
while (left <= right) {
mid = left + (right - left) / 2;
if (validEnergy(arr, mid)) {
ret = mid;
right = mid - 1;
} else {
left = mid + 1;
}
}
System.out.println("Case " + t + ": " + ret);
}
}
}
class MyScanner {
BufferedReader br;
StringTokenizer st;
public MyScanner(InputStream is) {
br = new BufferedReader(new InputStreamReader(is));
}
String next() {
while (st == null || !st.hasMoreElements()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
long nextLong() {
return Long.parseLong(next());
}
double nextDouble() {
return Double.parseDouble(next());
}
String nextLine() {
String str = "";
try {
str = br.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}
}