cf-379D-New Year Letter

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枚举s1,s2字串的纯AC的个数。
然后加上s1-s2,s2-s1,s1-s1,s2-s2中产生的AC的个数。
注意：数的范围
#include <stdio.h>#include<string.h>#include<iostream>#include<algorithm>#include<stdlib.h>#include<math.h>#include<stack>#define LL __int64#define maxn 20000using namespace std;LL num[55][7];//1,2,12,21,11,22int wei[55];int shou[55];int k,s,n,m;int t1,t2,t3;void init(){    int i,j;    memset(num,0,sizeof(num));    num[1][1]=1;    num[2][2]=1;    wei[1]=shou[1]=1;    wei[2]=shou[2]=2;    for(i=3;i<=50;i++)    {        for(j=1;j<=6;j++)num[i][j]=num[i-2][j]+num[i-1][j];        if(wei[i-2]==1)        {            if(shou[i-1]==1)num[i][5]++;            else num[i][3]++;        }        else        {            if(shou[i-1]==1)num[i][4]++;            else num[i][6]++;        }        wei[i]=wei[i-1];        shou[i]=shou[i-2];    }}int dos(int need,int xx,int yy){   /// cout<<need<<endl;    int i,j;    int a[4]={1,1,2,0};    int b[4]={1,1,0,2};    int a1,a2;    int b1,b2;    a1=a2=b1=b2=0;    for(i=0;i<(1<<4);i++)    {        int x,y;        x=xx;        y=yy;        a1=a2=b1=b2=0;        int leaps=1;        int nn;        nn=0;        for(j=0;j<4;j++)        {            if(i&(1<<j))            {                if(j==0)a2=b1=1;                if(j==1)a1=b2=1;                if(j==2)a1=a2=1;                if(j==3)b1=b2=1;            }        }        if(a1+a2>xx)continue;        if(b1+b2>yy)continue;        if(a2==1&&b1==1)nn+=num[k][3];        if(a1==1&&b2==1)nn+=num[k][4];        if(a2==1&&a1==1)nn+=num[k][5];        if(b2==1&&b1==1)nn+=num[k][6];        if(nn==need)        {            t3=i;            return 1;        }    }    return 0;}void print(){   // cout<<t1<<" "<<t2<<" "<<t3<<endl;    int i,j;    char stra[501];    char strb[501];    for(i=0;i<201;i++)stra[i]=strb[i]='B';    for(i=0;i<4;i++)    {        if((1<<i)&t3)        {            if(i==0)stra[n-1]='A',strb[0]='C';            if(i==1)stra[0]='C',strb[m-1]='A';            if(i==2)stra[0]='C',stra[n-1]='A';            if(i==3)strb[0]='C',strb[m-1]='A';        }    }    if(stra[0]=='B')i=0;    else i=1;    for(j=1;j<=t1;j++)    {        stra[i]='A';        stra[i+1]='C';        i+=2;    }    if(strb[0]=='B')i=0;    else i=1;    for(j=1;j<=t2;j++)    {        strb[i]='A';        strb[i+1]='C';        i+=2;    }    for(i=0;i<n;i++)cout<<stra[i];    cout<<endl;    for(i=0;i<m;i++)cout<<strb[i];    cout<<endl;}int main(){    int i,j;    init();   // for(i=1;i<=6;i++)cout<<num[i][6]<<endl;   //cout<<num[48][2]<<endl;  // cout<<num[48][3]<<endl;    while(~scanf("%d%d%d%d",&k,&s,&n,&m))    {        int leap=0;        for(i=0;i*2<=n;i++)        {            for(j=0;j*2<=m;j++)            {                t1=i;                t2=j;                t3=0;                LL xx=num[k][1]*i;                LL yy=num[k][2]*j;                //cout<<xx<<" "<<yy<<endl;                if(xx+yy>s)                {                    leap=0;                    break;                }                if(xx+yy==s)                {                    leap=1;                    break;                }                if(dos(s-xx-yy,n-i*2,m-j*2))                {                    leap=1;                    break;                }            }            if(leap==1)break;        }        if(leap==1)print();        else cout<<"Happy new year!"<<endl;    }    return 0;}
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