Submission #939498

#	Time	Username	Problem	Language	Result	Execution time	Memory
939498		vjudge1	Snake Escaping (JOI18_snake_escaping)	C++17	75 / 100	2057 ms	28148 KiB

snake_escaping

#include <bits/stdc++.h>

#pragma optimize("Ofast")
#pragma target("avx2")

using namespace std;

#define ll long long
#define ld long double
#define pb push_back
#define pf push_front
#define pii pair<int,int>
#define all(v) v.begin(),v.end()
#define F first
#define S second
#define mem(a,i) memset(a,i,sizeof(a))
#define sz(s) (int)s.size()
#define y1 yy
#define ppb pop_back
#define lb lower_bound
#define ub upper_bound
#define gcd(a,b) __gcd(a,b)
#define in insert
// #define int ll

const int MAX=1e5+15;
const int B=2e5;
const int N=104;
const int block=450;
const int maxB=MAX/B+10;
const ll inf=1e18;  
const int mod=1e9+7;
const int mod1=1e9+9;
const ld eps=1e-9;

int dx[8]={1,0,-1,0,1,-1,-1,1};
int dy[8]={0,1,0,-1,1,-1,1,-1};

int binpow(int a,int n){
  if(!n)return 1;
  if(n%2==1)return a*binpow(a,n-1);
  int k=binpow(a,n/2);
  return k*k;
}

int n,q;
string s;
int dp1[(1<<21)];
int dp0[(1<<21)];

int bit(int i,int j){
  return (i>>j)&1;
}

int stupid(string t){
  int ans=0;
  int c=0;
  for(int j=0;j<n;j++)if(t[j]=='?')c++;
  for(int i=0;i<(1<<c);i++){
    int cur=0;
    int f=0;
    for(int j=0;j<n;j++){
      if(t[j]!='?'){
        f=f*2+(t[j]-'0');
      }
      else{
        f=f*2+bit(i,cur++);
      }
    }
    ans+=s[f]-'0';
  }
  return ans;
}

void solve(){
  cin>>n>>q;
  cin>>s;
  for(int mask=0;mask<(1<<n);mask++)dp1[mask]=s[mask]-'0';
  for(int i=0;i<=n;i++){
    for(int mask=(1<<n)-1;mask>=0;mask--){
      if(!((mask>>i)&1)){
        dp1[mask]+=dp1[mask+(1<<i)];
      }
    }
  }
  for(int mask=0;mask<(1<<n);mask++)dp0[mask]=s[mask]-'0';
  for(int i=0;i<n;i++){
    for(int mask=0;mask<(1<<n);mask++){
      if((mask>>i)&1){
        dp0[mask]+=dp0[mask-(1<<i)];
      }
    }
  }
  while(q--){
    string t;
    cin>>t;
    int c0=0,c1=0,c=0;
    for(int i=0;i<n;i++){
      if(t[i]=='0')c0++;
      else if(t[i]=='1')c1++;
      else c++;
    }
    if(c<=min(c1,c0)){
      cout<<stupid(t)<<"\n";
    }
    else if(c0<=c1){
      int ans=0;
      for(int mask=0;mask<(1<<c0);mask++){
        int f1=0;
        int cur=0;
        int c=0;
        for(int j=0;j<n;j++){
          if(t[j]=='1'){
            f1=f1*2+1;
          }
          else if(t[j]=='?'){
            f1=f1*2;
          }
          else{
            f1=f1*2;
            if(bit(mask,cur++)){
              f1++;
              c++;
            }
          }
        }
        int res=dp1[f1];
        if(c%2==1)ans-=res;
        else ans+=res;
      }
      cout<<ans<<"\n";
    }
    else{
      int ans=0;
      for(int mask=0;mask<(1<<c1);mask++){
        int f1=0;
        int cur=0;
        int c=0;
        for(int j=0;j<n;j++){
          if(t[j]=='0'){
            f1=f1*2;
          }
          else if(t[j]=='?'){
            f1=f1*2+1;
          }
          else{
            f1=f1*2;
            if(!bit(mask,cur)){
              f1++;
            }
            if(bit(mask,cur)){
              c++;
            }
            cur++;
          }
        }
        // cout<<f<<" "<<f1<<"\n";
        int res=dp0[f1];
        if(c%2==1)ans-=res;
        else ans+=res;
      }
      cout<<ans<<"\n";
    }
  }
}

//1010
//0011

signed main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  // prec();
  int t=1;
  // cin>>t;
  while(t--)solve();
}

Compilation message (stderr)

snake_escaping.cpp:3: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    3 | #pragma optimize("Ofast")
      | 
snake_escaping.cpp:4: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    4 | #pragma target("avx2")
      |

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 10 / 10
• Subtask 4: 53 / 53
• Subtask 5: 0 / 25