refactor(P1896.cpp): 移除未使用的头文件以简化代码

移除<cstdio>和<string>头文件，这些在当前实现中未被使用，减少不必要的依赖

src/8/30/P1896.cpp

@@ -0,0 +1,78 @@
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <istream>
+#include <vector>
+
+using ll = int64_t;
+
+ll n,K;
+std::vector<ll> line;
+std::vector<std::vector<std::vector<ll>>> dp;
+
+static inline constexpr ll get1n(ll x){
+    return __builtin_popcount(x);
+}
+
+int main(){
+    std::iostream::sync_with_stdio(false);
+    std::cin.tie(nullptr);
+
+    std::cin>>n>>K;
+    // std::cout<<n<<" "<<K<<"\n";
+    line.reserve(n*n+1);
+    line.push_back(0);
+    for(ll msk=0;msk<(1ll<<n);++msk){
+        for(ll i=1;i<=n;i++){
+            if((msk>>i)&1){
+                if((msk>>(i-1))&1 || msk>>(i+1)&1){
+                    goto nxt;
+                }
+            }
+        }
+        line.push_back(msk);
+        nxt:;
+    }
+    // for(ll i:line){
+    //     char buff[10];
+    //     memset(buff, 0, sizeof(buff));
+    //     itoa(i, buff, 2);
+    //     printf("%s\n",buff);
+    // }
+    dp.resize(n+1,std::vector<std::vector<ll>>(line.size(),std::vector<ll>(K+1)));
+
+    
+    for(ll j=1;j<line.size();j++){
+        ll num1 = get1n(line[j]);
+        if(num1>K)continue;
+        dp[1][j][num1]=1;
+    }
+
+    for(ll i=2;i<=n;i++){
+        for(ll j=1;j<line.size();j++){
+            ll cur1n = get1n(line[j]);
+            for(ll k=1;k<line.size();k++){
+                ll k1n = get1n(line[k]);
+                if(k1n+cur1n>K)continue;
+                if(
+                    line[j] & line[k]
+                    || line[j] & (line[k]<<1)
+                    || line[j] & (line[k]>>1)
+                ){
+                    continue;
+                }else{
+                    for(ll x=cur1n;x<=K;x++){
+                        dp[i][j][x]+=dp[i-1][k][x-cur1n];
+                    }
+                }
+            }
+        }
+    }
+
+    ll ans=0;
+    for(ll j=1;j<line.size();j++){
+        ans+=dp[n][j][K];
+    }
+    std::cout<<ans<<"\n";
+}

src/8/30/P1896_pai.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+#include <random>
+
+std::random_device rd{};
+
+std::mt19937 mt{rd()};
+
+int main(){
+    std::uniform_int_distribution uni1{1,9}, uni2{1,81};
+    std::cout<<uni1(mt)<<" "<<uni2(mt)<<"\n";
+}