"Hdoj" 2209 Turn card Game

State compression + bi-directional wide search. Note Control time t.

/*2209*/#include<iostream>#include<string>#include<map>#include<queue>#include<Set>#include<stack>#include<vector>#include<deque>#include<algorithm>#include<cstdio>#include<cmath>#include<ctime>#include<cstring>#include<climits>#include<cctype>#include<cassert>#include<functional>using namespacestd;//#pragma COMMENT (linker, "/stack:102400000,1024000")#defineSTI set<int>#defineStpii Set<pair<int, int> >#defineMpii map<int,int>#defineVI vector<int>#definePII pair<int,int>#defineVpii vector<pair<int,int> >#defineRep (I, A, n) for (int i=a;i<n;++i)#definePer (i, a, n) for (int i=n-1;i>=a;--i)#defineCLR Clear#definePB Push_back#defineMP Make_pair#defineFIR First#defineSEC Second#defineAll (x) (x). Begin (), (x). End ()#defineSZ (x) ((int) (x). Size ())#defineLson L, Mid, rt<<1#defineRson mid+1, R, rt<<1|1Const intMAXN =1<< -;BOOLmark1[maxn+5];BOOLmark2[maxn+5];Chars[ -];intm[ -];voidinit () {m[0] =1; Rep (I,1, -) M[i]= m[i-1]<<1;}voidBFs () {Queue<int>Q1, Q2; intx =0, XX; intI, j, K; intt =0; memset (Mark1,false,sizeof(MARK1)); memset (MARK2,false,sizeof(MARK2));  for(i=0; S[i]; ++i) x= (x<<1) + s[i]-'0'; if(x = =0) {puts ("0"); return ; }        intL =i;    Q1.push (x); MARK1[X]=true; Q2.push (0); mark2[0] =true; intsz1, SZ2;  while(! Q1.empty () &&!Q2.empty ()) {        ++T; SZ1=SZ (Q1);  while(sz1--) {x=Q1.front ();            Q1.pop ();  for(i=0; i<l; ++i) {xx=x; XX^=M[i]; if(i) XX^= m[i-1]; if(i+1<l) XX^= m[i+1]; if(Mark1[xx])Continue; if(Mark2[xx]) {printf ("%d\n", t+t-1); return ; } Mark1[xx]=true;            Q1.push (XX); }} SZ2=SZ (Q2);  while(sz2--) {x=Q2.front ();            Q2.pop ();  for(i=0; i<l; ++i) {xx=x; XX^=M[i]; if(i) XX^= m[i-1]; if(i+1<l) XX^= m[i+1]; if(Mark2[xx])Continue; if(Mark1[xx]) {printf ("%d\n", t+t); return ; } Mark2[xx]=true;            Q2.push (XX); }}} puts ("NO");}intMain () {Ios::sync_with_stdio (false); #ifndef Online_judge Freopen ("data.in","R", stdin); Freopen ("Data.out","W", stdout); #endifinit ();  while(SCANF ("%s", s)! =EOF)    {BFS (); } #ifndef Online_judge printf ("Time =%d.\n", (int) clock ()); #endif        return 0;}

"Hdoj" 2209 Turn card Game