51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
#include<iostream>
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#include<cstdio>
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#include<cstring>
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#define N 2000000
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using namespace std;
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int m[2][2]={0,0,0,1};
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int Nim_Mult_Power(int x,int y){
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if(x<2)
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return m[x][y];
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int a=0;
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for(;;a++)
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if(x>=(1<<(1<<a))&&x<(1<<(1<<(a+1))))
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break;
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int m=1<<(1<<a);
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int p=x/m,s=y/m,t=y%m;
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int d1=Nim_Mult_Power(p,s);
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int d2=Nim_Mult_Power(p,t);
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return (m*(d1^d2))^Nim_Mult_Power(m/2,d1);
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}
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int Nim_Mult(int x,int y){
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if(x<y)
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return Nim_Mult(y,x);
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if(x<2)
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return m[x][y];
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int a=0;
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for(;;a++)
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if(x>=(1<<(1<<a))&&x<(1<<(1<<(a+1))))
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break;
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int m=1<<(1<<a);
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int p=x/m,q=x%m,s=y/m,t=y%m;
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int c1=Nim_Mult(p,s),c2=Nim_Mult(p,t)^Nim_Mult(q,s),c3=Nim_Mult(q,t);
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return (m*(c1^c2))^c3^Nim_Mult_Power(m/2,c1);
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}
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int main(){
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int t,n,x,y;
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scanf("%d",&t);
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while(t--){
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scanf("%d",&n);
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int ret=0;
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while(n--){
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scanf("%d%d",&x,&y);
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ret^=Nim_Mult(x,y);
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}
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if(ret)
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puts("Have a try, lxhgww.");
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else
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puts("Don't waste your time.");
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}
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return 0;
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}
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