HDU 5724 Chess Game

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An n-row 20-column checkerboard. Each line has a number of pieces. Two people in turn, each time a piece can be moved to the right one position, if it has a piece to the right, skip this piece, if there are a number of pieces, will be the number of skipped. But the pieces cannot move out of the boundary.

If there is no way to move, even if you lose. Ask you to go first can win.

Only 20 columns, so the SG value of all states is preprocessed. And then the direct different or just fine.

Then sg[(1<<20)-1] = 0, which is required to lose the state, the other can be DFS out, the specific look at the code.

#include <bits/stdc++.h>using namespacestd;#definePB (x) push_back (x)#definell Long Long#defineMK (x, y) make_pair (x, y)#defineLson L, M, rt<<1#defineMem (a) memset (a, 0, sizeof (a))#defineRson m+1, R, rt<<11#defineMem1 (a) memset (a,-1, sizeof (a))#defineMEM2 (a) memset (a, 0x3f, sizeof (a))#defineRep (i, N, a) for (int i = A; i<n; i++)#defineFi first#defineSe Secondtypedef pair<int,int>PLL;Const DoublePI = ACOs (-1.0);Const DoubleEPS = 1e-8;Const intMoD = 1e9+7;Const intINF =1061109567;Const intdir[][2] = { {-1,0}, {1,0}, {0, -1}, {0,1} };intsg[1<< A];intMexintx) {    if(~Sg[x])returnx; BOOLvis[ -]; memset (Vis,false,sizeof(VIS));  for(inti =0; I < -; i++) {        if(((1<<i) &x) = =0&& (1<< (i+1)) &x)) {intJ;  for(j = i +2; J < -; J + +) {                if(! (1<<j&x)) Break; }             for(intK = i+1; K <= J; k++) {                intSTA = x^ (1<<i) ^ (1<<k); if(Sta>= (1<< -))                     Break;                MEX (STA); Vis[sg[sta]]=1; }        }    }     for(inti =0; I < -; i++)        if(!Vis[i])returnSG[X] =i;}voidinit () {MEM1 (SG); sg[(1<< -)-1] =0;  for(inti =0; I < (1<< -); i++) {        if(Sg[i] = =-1) {mex (i); }    }}intMain () {init (); intt, N, M, X; CIN>>T;  while(t--) {cin>>N; intAns =0;  for(inti =0; I < n; i++) {scanf ("%d", &m); intSTA =0;  while(m--) {scanf ("%d", &x); STA|= (1<< ( --x)); } ans^=Sg[sta]; }        if(ans) {puts ("YES"); } Else{puts ("NO"); }    }}

HDU 5724 Chess Game