diff --git a/day12/U466168/U466168.cpp b/day12/U466168/U466168.cpp
index ca6224d..ab84c05 100644
--- a/day12/U466168/U466168.cpp
+++ b/day12/U466168/U466168.cpp
@@ -1,4 +1,4 @@
-//30%Points k==1
+//60%Points k==1 & 1->k->n
 
 #include<bits/stdc++.h>
 #include <cstdlib>
@@ -21,15 +21,28 @@ int main(){
     for(int i=1;i<=n;i++){
         nodes[i].t=readint();
     }
-    if(k==1){AC_KE_Q1();exit(0);}
-    
-}
-void AC_KE_Q1(){
     for(int i=1;i<=m;i++){
         const int u=readint(),v=readint();
         nodes[u].next.push_back(v);
         nodes[v].next.push_back(u);
     }
+    if(k==1){AC_KE_Q1();exit(0);}
+    int uNum=k-1;
+    cout<<"P";
+    for(int i=2;i<n;i++){
+        if(uNum){
+            uNum--;
+            cout<<"U";
+        }else{
+            cout<<"P";
+        }
+    }
+    cout<<"U"<<endl;
+}
+
+
+
+void AC_KE_Q1(){
     bool isUPrint = false;
     for(int i=1;i<=n;i++){
         if (!isUPrint) {
diff --git a/day13/P1616/P1616.cpp b/day13/P1616/P1616.cpp
new file mode 100644
index 0000000..ed56162
--- /dev/null
+++ b/day13/P1616/P1616.cpp
@@ -0,0 +1,39 @@
+#include<bits/stdc++.h>
+using namespace std;
+#define int long long
+
+const int MAX_M=1e4+5;
+const int MAX_T=1e7+5;
+int T,m;
+int t[MAX_M],v[MAX_M];
+int dp[MAX_T];
+
+int readint();
+
+signed main(){
+    T=readint(),m=readint();
+    for(int i=1;i<=m;i++){
+        t[i]=readint();
+        v[i]=readint();
+    }
+    for(int i=1;i<=m;i++){
+        for(int j=t[i];j<=T;j++){
+            dp[j] = max(dp[j],dp[j-t[i]]+v[i]);
+        }
+    }
+    cout<<dp[T]<<endl;
+}
+
+int readint(){
+    int x=0,w=1;
+    char ch=0;
+    while(!isdigit(ch)){
+        if(ch=='-')w=-1;
+        ch=getchar();
+    }
+    while(isdigit(ch)){
+        x=x*10+(ch-'0');
+        ch=getchar();
+    }
+    return x*w;
+}
\ No newline at end of file
diff --git a/day13/P1616/P1616_10.in b/day13/P1616/P1616_10.in
new file mode 100644
index 0000000..09bb9e1
--- /dev/null
+++ b/day13/P1616/P1616_10.in
@@ -0,0 +1,2 @@
+10000000 1
+1 10000
diff --git a/day13/P1616/P1616_10.out b/day13/P1616/P1616_10.out
new file mode 100644
index 0000000..bb9f62c
--- /dev/null
+++ b/day13/P1616/P1616_10.out
@@ -0,0 +1 @@
+100000000000
diff --git a/day13/P2871/P2871.cpp b/day13/P2871/P2871.cpp
new file mode 100644
index 0000000..e9d296c
--- /dev/null
+++ b/day13/P2871/P2871.cpp
@@ -0,0 +1,41 @@
+//AC
+#include<bits/stdc++.h>
+using namespace std;
+
+const int MAX_M = 1'2880+5;
+int dp[MAX_M],w[MAX_M],v[MAX_M];
+int n,m;
+
+int readint();
+
+int main(){
+    n=readint();
+    m=readint();
+
+    for(int i=1;i<=n;i++){
+        w[i]=readint();
+        v[i]=readint();
+    }
+
+    for(int i=1;i<=n;i++){
+        for(int j=m;j>=w[i];j--){
+            dp[j]=max(dp[j-w[i]]+v[i],dp[j]);
+        }
+    }
+
+    cout<<dp[m]<<endl;
+}
+
+int readint(){
+    int x=0,w=1;
+    char ch =0;
+    while(!isdigit(ch)){
+        if(ch=='-')w=-1;
+        ch=getchar();
+    }
+    while(isdigit(ch)){
+        x=x*10+(ch-'0');
+        ch=getchar();
+    }
+    return x*w;
+}
\ No newline at end of file
diff --git a/day13/背包DP-基本操作.pdf b/day13/背包DP-基本操作.pdf
new file mode 100644
index 0000000..1f21133
Binary files /dev/null and b/day13/背包DP-基本操作.pdf differ
diff --git a/xmake.lua b/xmake.lua
index d208731..71c8094 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -145,4 +145,12 @@ target("U466178")
     for v=1,8 do 
         local s = tostring(v)
         add_tests(s,{files="day12/U466178/U466178.cpp",defines="OITEST",run_timeout=1000,runargs={"ex_circle"..s..".in","ex_circle"..s..".ans"}})
-    end 
\ No newline at end of file
+    end 
+
+target("P2871")
+    set_rundir("day13/P2871")
+    add_files("day13/P2871/*.cpp")
+
+target("P1616")
+    set_rundir("day13/P1616")
+    add_files("day13/P1616/*.cpp")
\ No newline at end of file