[20251025] PGM / LV4 / 징검다리 / 강신지

ksinji/202510/25 PGM 징검다리.md

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+```java
+import java.util.*;
+
+class Solution {
+    public int solution(int distance, int[] rocks, int n) {
+        Arrays.sort(rocks);
+
+        int start = 0;
+        int end = distance;
+        int answer = 0;
+
+        while (start <= end) {
+            int mid = (start+end)/2;
+            int cnt = cntRemove(rocks, mid, distance);
+            if (cnt <= n){
+                answer = Math.max(mid, answer);
+                start = mid + 1;
+            } else {
+                end = mid - 1;
+            }
+        }
+
+        return answer;
+    }
+
+    private int cntRemove(int[] rocks, int mid, int distance){
+        int start = 0;
+        int cnt = 0;
+
+        for (int i=0; i<rocks.length; i++){
+            if (rocks[i] - start >= mid) {
+                start = rocks[i];
+            } else {
+                cnt++;
+            }
+        }
+
+        if (distance - start < mid){
+            cnt++;
+        }    
+        return cnt;
+    }
+}
+```