10-2总结

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dp,考试的时候想到统计方案然后暴力+乱搞，乱搞抽了只有30

dp[I][j]表示前i个数，j为xor后的值

//Copyright(c)2015 liuchenrui#include<cstdio>#include<ctime>#include<iostream>#include<algorithm>#define rep(i_) for(int i_=1;i_<=n;i_++)using namespace std;int ans;int g[101][101];bool found;inline void R(int &v){v=0;char c=0;int p=1;while(c<'0' || c>'9'){if(c=='-')p=-1;c=getchar();}while(c>='0' && c<='9'){v=(v<<3)+(v<<1)+c-'0';c=getchar();}v*=p;}int n;int len[101];int list[101][101];int mc[101];void dfs(int size){int i,j,k;if(len[size]==0){if(size>ans){ans=size;found=true;}return;}for(k=0;k<len[size] && !found;++k){if(size+len[size]-k<=ans)break;i=list[size][k];if(size+mc[i]<=ans)break;for(j=k+1,len[size+1]=0;j<len[size];++j){if(g[i][list[size][j]])list[size+1][len[size+1]++]=list[size][j];}dfs(size+1);}}void max_cluster(){int i,j;mc[n]=ans=1;for(i=n-1;i;--i){found=false;len[1]=0;for(j=i+1;j<=n;++j){if(g[i][j])list[1][len[1]++]=j;}dfs(1);mc[i]=ans;}}int main(){freopen("clique.in","r",stdin);freopen("clique.out","w",stdout);R(n);rep(i)rep(j){int x;R(x);if(x==1)g[i][j]=true;if(i==j)g[i][j]=true;}max_cluster();printf("%d\n",ans);//fprintf(stderr,"%d\n",clock());}

裸的最大团，对拍盘盘T结果数据水爆，100

//Copyright(c)2015 liuchenrui#include<cstdio>#include<ctime>#include<iostream>#include<algorithm>#define ll long long#define mod 1998585857using namespace std;inline void R(ll &v){v=0;char c=0;ll p=1;while(c<'0' || c>'9'){if(c=='-')p=-1;c=getchar();}while(c>='0' && c<='9'){v=(v<<3)+(v<<1)+c-'0';c=getchar();}v*=p;}ll n,a[10001];ll t[1001];ll ans=0;ll ksm(ll a,ll b,ll c){ll ret=1;while(b>0){if(b&1)ret=(1ll*ret*a)%c;b>>=1;a=(1ll*a*a)%c;}return ret;}ll dp[2][4096];int main(){freopen("set.in","r",stdin);freopen("set.out","w",stdout);R(n);for(int i=1;i<=n;i++)R(a[i]);dp[0][0]=1;for(ll i=1;i<=n;i++)for(ll j=0;j<=4095;j++)dp[i&1][j]=(dp[(i-1)&1][j]+dp[(i-1)&1][j^a[i]]+dp[(i-1)&1][j^a[i]])%mod;ans=ksm(3,n,mod);ll tmp=ksm(2,mod-2,mod);ans=ans-(ll)dp[n&1][0];ans=1ll*ans*tmp%mod;ans=(ans%mod+mod)%mod;cout<<ans<<endl;}

反质数加强版，写了高精还是滚粗了，15

写不来代码= =

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