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  1. //#define DEBUG       //comment when you have to disable all debug macros.
  2. //#define LOCAL     //uncomment for testing from local file
  3. #define NDEBUG    
  4. #include<bits/stdc++.h>
  5.  
  6. #define fd(i,a) for(i=1;i<=a;i++)
  7. #define fa(i,a,b) for(i=a;i<=b;i++)
  8. #define fs(i,a,b,c) for(i=a;i<=b;i+=c)
  9. #define tr(c,i) for(typeof(c.begin()) i = (c).begin(); i != (c).end(); i++) 
  10. #define present(c,x) ((c).find(x) != (c).end()) 
  11. #define all(x) x.begin(), x.end()
  12. #define clr(x,y) memset(x,y,sizeof x)
  13. #define log2(x) (log(x)/log(2))
  14. #define ARRAY_SIZE(arr) (1[&arr]-arr)      
  15. #define INDEX(arr,elem)        (lower_bound(all(arr),elem)-arr.begin())
  16. #define equals(a,b) (a.compareTo(b)==0)    //for strings only
  17. template<class P, class Q> inline void smin(P &a, Q b) { if (b < a) a = b; }
  18. template<class P, class Q> inline void smax(P &a, Q b) { if (a < b) a = b; }
  19.  
  20. #define pb push_back
  21. #define mp make_pair
  22. #define lld long long int
  23. #define MOD 1000000007
  24. #define gcd __gcd
  25.  
  26. using namespace std;
  27.  
  28. #ifdef DEBUG
  29. #define debug(args...)            {dbg,args; cerr<<endl;}
  30. #else
  31. #define debug(args...)              // Just strip off all debug tokens
  32. #endif
  33.  
  34. struct debugger
  35. {
  36.   template<typename T> debugger& operator , (const T& v)
  37.   {    
  38.     cerr<<v<<" ";    
  39.     return *this;    
  40.   }
  41.  
  42. }dbg;
  43.  
  44. template<class T>
  45. inline void inputInt(T &n )
  46. {
  47.   n=0;
  48.  
  49.   T ch=getchar_unlocked();
  50.   /*int sign=1;
  51.     while(( ch < '0' || ch > '9') && ch!='-')
  52.     ch=getchar_unlocked();
  53.     if(ch=='-')
  54.     {
  55.     sign=-1;
  56.     ch=getchar_unlocked();
  57.     }
  58.     while(  ch >= '0' && ch <= '9' )
  59.     n = (n<<3)+(n<<1) + ch-'0', ch=getchar_unlocked();
  60.     n*=sign;*/
  61.   while( ch < '0' || ch > '9')
  62.     ch=getchar_unlocked();
  63.   while(  ch >= '0' && ch <= '9' )
  64.     n = (n<<3)+(n<<1) + ch-'0', ch=getchar_unlocked();
  65. }
  66.  
  67. inline void inputStr(string &str){
  68.   str="";
  69.   char ch = getchar_unlocked();
  70.   debug(ch);
  71.   int i=0;
  72.   while(ch<33){ch=getchar_unlocked();}
  73.   while(ch!='\n'){str+=ch;ch=getchar_unlocked();}
  74. }
  75.  
  76.  
  77. int main()
  78. {
  79. #ifdef LOCAL
  80.   freopen("input.in","r",stdin);
  81. #endif
  82.   int T,n,m;
  83.   string s;
  84.   cin>>T;
  85.   while(T--){
  86.     cin>>n>>m>>s;
  87.     int len = s.length(), L,U,R,D, h=0, v=0;
  88.     debug("yo",s);
  89.     bool safe=true;
  90.     L=U=R=D=0;
  91.     for(int i=0;i<len;i++){
  92.       if(s[i]=='L')h--;
  93.       else if(s[i]=='R')h++;
  94.       else if(s[i]=='U')v++;
  95.       else v--;
  96.       if(h<0 && abs(h)>L)L=abs(h);
  97.       else if(h>0 && abs(h)>R)R=abs(h);
  98.       if(v<0 && abs(v)>D)D=abs(v);
  99.       else if(v>0 && abs(v)>U)U=abs(v);
  100.       debug(h,v,L,R,U,D,m,n);
  101.       if(L+R>=m || U+D>=n){
  102.         safe=false;
  103.         break;
  104.       }
  105.     }
  106.     printf("%s\n",safe?"safe":"unsafe");
  107.   }
  108. }
Success #stdin #stdout 0s 16064KB
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https://ideone.com/Tzu9d8
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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