diff --git a/programmers/택배 배달과 수거하기/solution.java b/programmers/택배 배달과 수거하기/solution.java
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+++ b/programmers/택배 배달과 수거하기/solution.java	
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+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/150369
+
+class Solution {
+    public long solution(int cap, int n, int[] deliveries, int[] pickups) {
+        long answer = 0;
+        int len = n, lm = len-1, lm2 = lm, tmp = 0;
+        while(true){
+            int maxD = 0, maxP = 0, pickCap = 0, delCap = 0, pm = -2, dm = -2;
+            boolean[] full = new boolean[2];
+			for(int x = lm; x>=0; x--){
+                int del = deliveries[x];
+                if(del==0) continue;
+                if(maxD == 0) maxD = x;
+                if(delCap != cap && del!=0){
+                    if(delCap<cap){
+                        if(del > cap - delCap) {
+                            tmp = cap - delCap; //더클때
+                            if(dm<x) dm = x;
+                        }
+                        else if(del == cap - delCap) { //같을때
+                            tmp = del;
+                            if(dm<x) dm = x-1;
+                        }
+                        else {
+                            tmp = del; //작을때
+                        }
+                        deliveries[x] -= tmp;
+                        delCap += tmp;
+                    }
+                }
+                if(delCap == cap) break;
+            }
+			
+            for(int x = lm2; x>=0; x--){
+                int pic = pickups[x];
+                if(pic == 0) continue;
+                if(maxP == 0) maxP = x;
+                if(pickCap != cap && pic!=0){
+                    if(pickCap<cap){
+                        if(pic > cap - pickCap) {
+                            tmp = cap - pickCap; //더클때
+                            if(pm<x) pm = x;
+                        }
+                        else if(pic == cap - pickCap) { //같을때
+                            tmp = pic;
+                            if(pm<x) pm = x-1;
+                        }
+                        else {
+                            tmp = pic; //작을때
+                        }
+                        pickups[x] -= tmp;
+                        pickCap += tmp;
+                    }
+                }
+                if(pickCap == cap) break;
+            }
+            lm = dm; lm2 = pm;
+            if(delCap == 0 && pickCap == delCap) break;
+            answer += 2*(Math.max(maxD,maxP)+1);
+        }
+        return answer;
+    }
+}
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