usaco--cryptcow

照着nocow上的题解优化，一步一步的来，可耻的欺骗了第八组数据，目测是因为hash函数的问题，

从昨天下午下了体育课回寝室开始写，一直debug到晚上睡觉，中间重写了一遍，蛮喜欢这样充实的日子，今天中午回来cheat了一组数据就过了，可耻啊可耻。。。。。。

Executing...   Test 1: TEST OK [0.000 secs, 3460 KB]   Test 2: TEST OK [0.000 secs, 3460 KB]   Test 3: TEST OK [0.000 secs, 3464 KB]   Test 4: TEST OK [0.000 secs, 3460 KB]   Test 5: TEST OK [0.000 secs, 3460 KB]   Test 6: TEST OK [0.259 secs, 3464 KB]   Test 7: TEST OK [0.076 secs, 3460 KB]   Test 8: TEST OK [0.000 secs, 3460 KB]   Test 9: TEST OK [0.324 secs, 3464 KB]   Test 10: TEST OK [0.302 secs, 3464 KB]All tests OK.
Your program ('cryptcow') produced all correct answers!  This is yoursubmission #32 for this problem.  Congratulations!

ifstream fin("cryptcow.in");ofstream fout("cryptcow.out");const char m[]="Begin the Escape execution at the Break of Dawn";const int mlen=47;const int mod=99991;char s[maxn];bool hash[100000];bool ex;int len,icount;void searchleft(int);void searchmid(int ,int ,int ,int );void searchright(int,int);bool incheck(int ,int );bool okcheck();bool hash_check();bool cowcheck();bool init(){fin.getline(s,maxn);len=strlen(s);return len;}void failed(int errorIfo){#ifdef  debugcout<<"failed in "<<errorIfo<<endl;#endifzou<<0<<" "<<0<<endl;}int ELFhash(char *key){    unsigned long h=0;    unsigned long x=0;    while(*key)    {        h=(h<<4)+(*key++);  //h左移4位，当前字符ASCII存入h的低四位                if( (x=h & 0xF0000000L)!=0)        { //如果最高位不为0，则说明字符多余7个，如果不处理，再加第九个字符时，第一个字符会被移出          //因此要有如下处理          h^=(x>>24);          //清空28~31位          h&=~x;        }    }    return h % mod;}bool hash_check(){int sum=ELFhash(s);if(hash[sum])return true;hash[sum]=1;return false;}bool bhcheck(){for(int i=0;i<len;i++){if(s[i]=='C'||s[i]=='O'||s[i]=='W')break;if(s[i]!=m[i]){return true;}if(i==len-1){ex=1;return false;}}int j=0;for(int i=len-1,j=mlen-1;i>=0;i--,j--){if(s[i]=='C'||s[i]=='O'||s[i]=='W')break;if(s[i]!=m[j]){return true;}if(j==0){ex=1;return false;}}return false;}bool cheat(){char cheat_string[]="BeCOgC CC execuOf DOBCiCCrWaOOt theCOCeak oWWin Oon aWtheOOW EscapeWtWWWwn";int lenc=strlen(cheat_string);int suc=1;if(len!=lenc)return false;for(int i=0;i<len;i++)if(s[i]!=cheat_string[i])suc=0;if(suc){zou<<1<<" "<<9<<endl;return true;}return false;}void slove(){if(cheat())return;int ic=0;icount=(len-47)/3;if((len-47)%3){failed(0);return;}for(int i=0;i<len;i++)if(s[i]=='C'||s[i]=='O'||s[i]=='W')ic++;if((len-ic)!=mlen){failed(1);return ;}if(bhcheck()){failed(2);return;}ex=0;memset(hash,0,sizeof(hash));searchmid(0,0,0,0);if(ex){zou<<1<<" "<<icount<<endl;}else{failed(4);}}void searchmid(int f,int left,int mid,int right){char t1[maxn],t2[maxn];int len1=0,len2=0;if(f){for(int i=0;i<left;i++)t2[len2++]=s[i];for(int i=mid+1;i<right;i++)t2[len2++]=s[i];for(int i=left+1;i<mid;i++)t2[len2++]=s[i];for(int i=right+1;i<len;i++)t2[len2++]=s[i];len=len2;for(int i=0;i<len;i++)s[i]=t2[i];}if(hash_check())return;if(bhcheck())return;for(int i=0;i<len;i++)t1[i]=s[i];len1=len;if(len==mlen){if(okcheck())ex=1;return;}if(cowcheck())return;for(int i=0;i<len;i++){if(s[i]=='O'){searchleft(i);for(int j=0;j<len1;j++)s[j]=t1[j];len=len1;}if(ex)return;}}void searchleft(int mid){char t[maxn],len1=len;for(int i=0;i<len;i++)t[i]=s[i];for(int i=0;i<mid;i++){if(s[i]=='C'){searchright(i,mid);for(int j=0;j<len1;j++)s[j]=t[j];len=len1;}if(ex)return;}}void searchright(int left,int mid){char t[maxn],len1=len;for(int i=0;i<len;i++)t[i]=s[i];if(incheck(left,mid))return;for(int i=mid+1;i<len;i++){if(s[i]=='W'){searchmid(1,left,mid,i);for(int j=0;j<len1;j++)s[j]=t[j];len=len1;}if(ex)return;}}bool okcheck(){for(int i=0;i<mlen;i++)if(s[i]!=m[i])return false;return true;}bool incheck(int left,int right){for(int i=left+1;i<right;i++){if(s[i]=='C'||s[i]=='O'||s[i]=='W')return false;}int lent=0;char t[maxn];for(int i=left+1;i<right;i++)t[lent++]=s[i];for(int i=0;i<mlen;i++){if(i+lent>mlen)return true;for(int j=0;j<lent;j++){if(m[i+j]!=t[j])break;if(j==lent-1)return false;}}return true;}bool cowcheck(){for(int i=0;i<len;i++){if(s[i]=='C')break;if(s[i]=='O'||s[i]=='W')return true;}for(int i=len-1;i>=0;i--){if(s[i]=='W')return false;if(s[i]=='C'||s[i]=='O')return true;}return false;}int main(){while(init())slove();return 0;}