3 files changed, 55 insertions, 12 deletions
diff --git a/works/solutions/acwing/2-2.cpp b/works/solutions/acwing/2-2.cpp
index de812f4..fb0fb3b 100644
--- a/works/solutions/acwing/2-2.cpp
+++ b/works/solutions/acwing/2-2.cpp
@@ -14,12 +14,8 @@ int main() {
   }
 
   for (int i = 1; i <= N; i++) {
-    for (int j = V; j >= 0; j--) {
-      if (j >= v[i]) {
-        states[j] = std::max(states[j], states[j - v[i]] + w[i]);
-      } else {
-        states[j] = states[j];
-      }
+    for (int j = V; j >= v[i]; j--) {
+      states[j] = std::max(states[j], states[j - v[i]] + w[i]);
     }
   }
 
diff --git a/works/solutions/acwing/3-2.cpp b/works/solutions/acwing/3-2.cpp
index 6565c5b..c099838 100644
--- a/works/solutions/acwing/3-2.cpp
+++ b/works/solutions/acwing/3-2.cpp
@@ -14,12 +14,8 @@ int main() {
   }
 
   for (int i = 1; i <= N; i++) {
-    for (int j = 0; j <= V; j++) {
-      if (j >= v[i]) {
-        states[j] = std::max(states[j], states[j - v[i]] + w[i]);
-      } else {
-        states[j] = states[j];
-      }
+    for (int j = v[i]; j <= V; j++) {
+      states[j] = std::max(states[j], states[j - v[i]] + w[i]);
     }
   }
 
diff --git a/works/solutions/acwing/4.cpp b/works/solutions/acwing/4.cpp
new file mode 100644
index 0000000..3270402
--- /dev/null
+++ b/works/solutions/acwing/4.cpp
@@ -0,0 +1,51 @@
+#include <algorithm>
+#include <iostream>
+
+int N, V;
+int v[101];
+int w[101];
+int s[101];
+int states[101];
+
+void CompletePack(int v, int w) {
+  for (int j = v; j <= V; j++) {
+    states[j] = std::max(states[j], states[j - v] + w);
+  }
+}
+
+void ZeroOnePack(int v, int w) {
+  for (int j = V; j >= v; j--) {
+    states[j] = std::max(states[j], states[j - v] + w);
+  }
+}
+
+int main() {
+  std::cin >> N >> V;
+
+  for (int i = 1; i <= N; i++) {
+    std::cin >> v[i] >> w[i] >> s[i];
+  }
+
+  for (int i = 1; i <= N; i++) {
+    if (v[i] * s[i] >= V) {
+      CompletePack(v[i], w[i]);
+    } else {
+      int k = 1;
+      int amount = s[i];
+
+      while (k < amount) {
+        ZeroOnePack(k * v[i], k * w[i]);
+        amount -= k;
+        k *= 2;
+      }
+
+      if (amount != 0) {
+        ZeroOnePack(amount * v[i], amount * w[i]);
+      }
+    }
+  }
+
+  std::cout << states[V];
+
+  return 0;
+}