diff --git a/src/7/21/T636331.cpp b/src/7/21/T636331.cpp
index 3dcc2b7..b656614 100644
--- a/src/7/21/T636331.cpp
+++ b/src/7/21/T636331.cpp
@@ -1,75 +1,13 @@
-#include <algorithm>
-#include <cstdint>
 #include <iostream>
-#include <limits>
-#include <set>
-#include <vector>
+#include <utility>
 
-using ll = int64_t;
-
-ll T,n;
-std::vector<std::vector<ll>> ta,tb;
-ll ans=std::numeric_limits<ll>::max();
-
-template<class ...Ts>
-void log(Ts&&...ts){
-    // std::cout<<"Log: ";
-    // ((std::cout<<ts<<' '),...);
-    // std::cout<<'\n';
-}
-
-void bfs(ll na,ll nb,ll nans,ll d){
-    if(d>n)return;
-    nans = std::max(na+nb,nans);
-    // log("na:",na,"nb:",nb,"nans:",nans,"ans:",ans);
-    if(na==1&&nb==1){
-        log("na:",na,"nb:",nb,"nans:",nans,"ans:",ans);
-        ans=std::min(ans,nans);
-        // log("nans:",nans);
-        return;
-    }
-    for(auto nxta:ta[na]){
-        for(auto nxtb:tb[nb]){
-            bfs(nxta,nxtb,nans,d+1);
-        }
-    }
-    if(nb!=1){
-        for(auto nxta:ta[na]){
-            bfs(nxta,nb,nans,d+1);
-        }
-    }
-    if(na!=1){
-        for(auto nxtb:tb[nb]){
-            bfs(na,nxtb,nans,d+1);
-        }
-    }
+static inline __attribute__((always_inline)) int max(int a,int b){
+    if(a>b)return a;
+    else return b;
 }
 
 int main(){
-    std::cin>>T;
-    while(T--){
-        ans=std::numeric_limits<ll>::max();
-        std::cin>>n;
-        ta.resize(n+1,std::vector<ll>());
-        tb.resize(n+1,std::vector<ll>());
-        for(ll i=1;i<n;i++){
-            ll u,v;
-            std::cin>>u>>v;
-            ta[u].push_back(v);
-            ta[v].push_back(u);
-        }
-        for(ll i=1;i<n;i++){
-            ll u,v;
-            std::cin>>u>>v;
-            tb[u].push_back(v);
-            tb[v].push_back(u);
-        }
-        ll sa{},sb{};
-        std::cin>>sa>>sb;
-        // std::set<ll> visa,visb;
-        // visa.insert(sa);
-        // visb.insert(sb);
-        bfs(sa,sb,0, 0);
-        std::cout<<ans<<'\n';
-    }
+    int a,b;
+    std::cin>>a>>b;
+    std::cout<<max(a,b)<<'\n';
 }
\ No newline at end of file
diff --git a/src/7/22/P6567.cpp b/src/7/22/P6567.cpp
new file mode 100644
index 0000000..3d9de9d
--- /dev/null
+++ b/src/7/22/P6567.cpp
@@ -0,0 +1,65 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <istream>
+#include <set>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+using ll = int64_t;
+
+ll n,m;
+std::vector<ll> k,a;
+std::vector<std::pair<ll, ll>> t;
+
+template<class ...Ts>
+void log(Ts&&...ts){
+    // std::cout<<"Log: ";
+    // ((std::cout<<ts<<' '),...);
+    // std::cout<<'\n';
+}
+
+namespace c1{
+    std::set<ll> s;
+    ll max{};
+    void static inline dfs(ll d,ll nsum){
+        if(nsum>max)return;
+        if(d>n){
+            s.insert(nsum);
+            log("nsum:",nsum);
+            return;
+        }
+        for(ll i=0;i<=a[d];i++){
+            dfs(d+1,nsum+k[d]*i);
+        }
+    }
+}
+
+int main(){
+    std::iostream::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+    std::cout.tie(nullptr);
+
+    std::cin>>n>>m;
+    k.resize(n+1);
+    a.resize(n+1);
+    t.resize(m+1);
+    for(ll i=1;i<=n;i++){
+        std::cin>>k[i]>>a[i];
+    }
+    for(ll i=1;i<=m;i++){
+        std::cin>>t[i].first;
+        t[i].second=i;
+        c1::max=std::max(c1::max,t[i].first);
+    }
+    using namespace c1;
+    dfs(1, 0);
+    for(ll i=1;i<t.size();i++){
+        if(auto it = s.find(t[i].first);it!=s.end()){
+            std::cout<<"Yes\n";
+        }else{
+            std::cout<<"No\n";
+        }
+    }
+}
\ No newline at end of file