Submission #331788

#	Time	Username	Problem	Language	Result	Execution time	Memory
331788		daniel920712	Snake Escaping (JOI18_snake_escaping)	C++14	22 / 100	1179 ms	65540 KiB

snake_escaping

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <string.h>
#include <map>
#include <utility>
#include <algorithm>
#include <stack>
using namespace std;
char all[1148576];
char tt[25];
int con[25][1100005];
int ans=0;
int N;
void F(int x,int y,int z)
{
    if(x==N)
    {
        if(z%2==0) ans+=con[N][y];
        else ans-=con[N][y];
        return;
    }
    if(tt[x]=='1')
    {
        F(x+1,y+(1<<(N-x-1)),z);
        F(x+1,y,z+1);
    }
    else if(tt[x]=='0') F(x+1,y,z);
    else F(x+1,y+(1<<(N-x-1)),z);

}
void F2(int x,int y)
{
    if(x==N)
    {
        ans+=(all[y]-'0');
        return;
    }
    if(tt[x]=='?')
    {
        F2(x+1,y);
        F2(x+1,y+(1<<(N-x-1)));
    }
    else F2(x+1,y+(1<<(N-x-1))*(tt[x]-'0'));
}
int main()
{
    int M,i,j,ok,a,b;
    scanf("%d %d",&N,&M);
    scanf("%s",all);
    for(i=0;i<(1<<N);i++) con[0][i]=all[i]-'0';
    for(i=0;i<N;i++)
    {
        for(j=0;j<(1<<N);j++)
        {
            con[i+1][j]=con[i][j];
            if(j&(1<<i)) con[i+1][j]+=con[i][j-(1<<i)];
        }
    }
    while(M--)
    {
        scanf("%s",tt);
        ans=0;
        a=0;
        b=0;
        for(i=0;i<N;i++)
        {
            if(tt[i]=='?') a++;
            else b++;
        }
        if(a>b) F(0,0,0);
        else F2(0,0);
        printf("%d\n",ans);

    }

	return 0;
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:49:15: warning: unused variable 'ok' [-Wunused-variable]
   49 |     int M,i,j,ok,a,b;
      |               ^~
snake_escaping.cpp:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   50 |     scanf("%d %d",&N,&M);
      |     ~~~~~^~~~~~~~~~~~~~~
snake_escaping.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   51 |     scanf("%s",all);
      |     ~~~~~^~~~~~~~~~
snake_escaping.cpp:63:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   63 |         scanf("%s",tt);
      |         ~~~~~^~~~~~~~~

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