Create 1317.cpp

VIJOS/1317.cpp

@@ -0,0 +1,47 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <algorithm>
+using namespace std;
+
+/// 0-1背包问题(一维数组空间优化)
+
+namespace Package1_SpaceOptimized
+{
+    const int MAXM = 30000 + 5;
+    const int MAXN = 25 + 5;
+    int ldp[MAXM];
+    int w[MAXN];
+    int v[MAXN];
+    int N,M;
+    void solve()
+    {
+        for(int i=1;i<=N;i++)
+        {
+            for(int j=M;j>=1;j--)///从M到1逆序循环
+            {
+                int a=ldp[j];
+                int b=-1;
+                if(j-w[i]>=0) b=ldp[j-w[i]]+v[i];
+                ldp[j]=max(a,b);
+            }
+        }
+        printf("%d\n",ldp[M]);
+    }
+    int main()
+    {
+        scanf("%d %d",&M,&N);
+        for(int i=1;i<=N;i++)
+        {
+            scanf("%d %d",&w[i],&v[i]);
+            v[i]=w[i]*v[i];
+        }
+        solve();
+        return 0;
+    }
+}
+
+int main()
+{
+    return Package1_SpaceOptimized::main();
+}