update

src/P5020/P5020.cpp

@@ -0,0 +1,55 @@
+#include <bitset>
+#include <cstring>
+#include <iostream>
+#include <algorithm>
+
+using ll = long long;
+
+struct ReadLL{
+    char c;
+    ll w,n;
+    ReadLL&operator>>(ll &num){
+        c=0,w=1,n=0;
+        while(!isdigit(c)){
+            if(c=='-')w=-1;
+            c=getchar();
+        }
+        while(isdigit(c)){
+            n=n*10+c-'0';
+            c=getchar();
+        }
+        num=n*w;
+        return *this;
+    }
+}readll;
+
+auto &is = readll;
+auto &os = std::cout;
+
+const ll max_n{100+5},max_a=2.5e4+5;
+ll t, n, a[max_n], ans;
+std::bitset<max_a> dp;
+
+int main(){
+    is>>t;
+    for(ll _{0};_<t;_++){
+        is>>n;
+        ans=n;
+        for(ll i{1};i<=n;i++){
+            is>>a[i];
+        }
+        std::sort(a+1,a+n+1);
+        dp.reset();
+        dp[0]=1;
+        for(ll i{1};i<=n;i++){
+            if(dp[a[i]]){
+                ans--;
+                continue;
+            }
+            for(ll j{a[i]};j<=a[n];j++){
+                dp[j]=dp[j]||dp[j-a[i]];
+            }
+        }
+        os<<ans<<'\n';
+    }
+}