제출 #341149

#제출 시각아이디문제언어결과실행 시간메모리
341149KWang31Plus Minus (BOI17_plusminus)Java
54 / 100
1026 ms57092 KiB
import java.io.*; import java.util.*; public class plusminus{ static class FastReader { BufferedReader br; StringTokenizer st; public FastReader() { br = new BufferedReader(new InputStreamReader(System.in)); } String next() { while (st == null || !st.hasMoreElements()) { try { st = new StringTokenizer(br.readLine()); } catch (IOException e) { e.printStackTrace(); } } return st.nextToken(); } int nextInt() { return Integer.parseInt(next()); } } static int MOD=1000000007; static int[] rk, p,siz; static HashMap<Integer, Integer> labelB, labelC; public static void main(String[] args){ FastReader br=new FastReader(); int N=br.nextInt(); int M=br.nextInt(); int K=br.nextInt(); int[][] cond=new int[K][3]; for (int i = 0; i < K; i++) { if(br.next().charAt(0)=='+'){ cond[i][2]++; }else{ cond[i][2]--; } cond[i][0]=br.nextInt()-1; cond[i][1]=br.nextInt()-1; } //a_ij=(-1)^i b_i + (-1)^j c_j - cond[i][2] //Case 1: a00=-1 long cur1; long cur2; long ans=0; int i,j,k; boolean checkerboard; for (int X = -1; X <=1; X+=2) {//X=a00 cur1=1; cur2=1; checkerboard=true; labelB=new HashMap<>(); labelC=new HashMap<>(); //b is ai0, c is a0i labelB.put(0,X); labelC.put(0,X); for (int n = 0; n < K; n++) {//Case 1: c_j=X(-1)^j i=cond[n][0]; j=cond[n][1]; k=cond[n][2]; if((i+j)%2==0 ^ k==X)checkerboard=false; if(j%2==0){ if(labelB.containsKey(i)){ if(labelB.get(i)!=k){ cur1=0; break; } }else{ labelB.put(i,k); } }else{ if(labelB.containsKey(i)){ if(labelB.get(i)==k){ cur1=0; break; } }else{ labelB.put(i, -k); } } } if(cur1==1){ cur1=pow(N-labelB.size()); } for (int n = 0; n < K; n++) {//Case 2 i=cond[n][0]; j=cond[n][1]; k=cond[n][2]; if(i%2==0){ if(labelC.containsKey(j)){ if(labelC.get(j)!=k){ cur2=0; break; } }else{ labelC.put(j,k); } }else{ if(labelC.containsKey(j)){ if(labelC.get(j)==k){ cur2=0; break; } }else{ labelC.put(j, -k); } } } if(cur2==1){ cur2=pow(M-labelC.size()); } ans+=cur1; ans%=MOD; ans+=cur2; ans%=MOD; //System.out.println(cur1+" "+cur2+" "+checkerboard); if(cur1>0 && cur2>0 && checkerboard){//-1 only if checkerboard ans+=(MOD-1); ans%=MOD; } //System.out.println(X); //System.out.println(cur1+" "+cur2); //System.out.println(labelB); //System.out.println(labelC); } System.out.println((ans+MOD)%MOD); } public static long pow(int x){ if(x==0)return 1; if(x==1)return 2; long y=pow(x/2); y*=y; y%=MOD; y*=pow(x&1); return y%MOD; } } //Debugging: //Are you sure your algorithm is correct? //Bounds: long //Special cases: n=0,1? //Make sure you remove your debugging code before you submit!
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