TC SRM 397 2 250

BreakingTheCode

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Problem Statement

You have been given a secret mission where you must break the enemy's code. You have already figured out that they encode messages using the following method. Each letter between 'a' and 'z', inclusive, is assigned a distinct two-digit number between 01 and 26, inclusive. A message is encoded by simply replacing each letter with its assigned number. For example, if 't' is assigned 20, 'e' is assigned 05 and 's' is assigned 19, then the message "test" is encoded as "20051920". All original messages contain only lowercase letters.

You are given a String code containing the assignment of numbers to letters. The first letter of code is assigned 01, the second is assigned 02 and so on. You are also given aString message which is either an original unencoded message or an encoded message. If you are given an unencoded message, return the encoded version of that message, and if you are given an encoded message, return the original unencoded message.

Definition

• ClassBreakingTheCode
• MethoddecodingEncoding
• Parametersstring , string
• Returnsstring
• Method signaturestring decodingEncoding(string code, string message)

(be sure your method is public)

Limits

• Time limit (s)2.000
• Memory limit (MB)64

Constraints

• code will contain exactly 26 characters.
• Each lowercase letter between 'a' and 'z', inclusive, will occur exactly once in code.
• message will contain between 1 and 50 characters, inclusive.
• message will either contain only lowercase letters ('a'-'z') or only digits ('0'-'9').
• If message contains only digits, it will be a concatenation of two-digit numbers, each between 01 and 26, inclusive.

Test cases

0.  

   • code"abcdefghijklmnopqrstuvwxyz"
   • message"test"

    

   Returns"20051920"

    

   Example from the problem statement. Here, the letters are coded in an alphabetical order.
1.  

   • code"abcdefghijklmnopqrstuvwxyz"
   • message"20051920"

    

   Returns"test"

    

   Now, we're decoding it.
2.  

   • code"qesdfvujrockgpthzymbnxawli"
   • message"mwiizkelza"

    

   Returns"19242626171202251723"
3.  

   • code"faxmswrpnqdbygcthuvkojizle"
   • message"02170308060416192402"

    

   Returns"ahxpwmtvza"

   #include <cstdio>
   #include <cmath>
   #include <cstring>
   #include <ctime>
   #include <iostream>
   #include <algorithm>
   #include <set>
   #include <vector>
   #include <sstream>
   #include <typeinfo>
   #include <fstream>
   
   using namespace std;
   
   class BreakingTheCode {
       public:
       string decodingEncoding(string code, string message) {
           int i,j;
           int a[30]={0};
           string k;
           k="";
           for(i=0;i<code.size();i++)
           {
               a[code[i]-'a'+1]=i+1;
           }
           if('0'<=message[0] && message[0]<='9')
           {
               for(i=0;i<message.size();i=i+2)
               {
                   int x=(message[i]-'0')*10;
                   x=x+(message[i+1]-'0');
                   k=k+code[x-1];
               }
           }
   
           else
           {
               for(i=0;i<message.size();i++)
               {
                   int x=message[i]-'a'+1,y;
                   y=a[x];
                   char h;
                   h='0'+y/10;
                   k=k+h;
                   h='0'+y%10;
                   k=k+h;
               }
           }
           return k;
       }
   };
   
   // CUT begin
   ifstream data("BreakingTheCode.sample");
   
   string next_line() {
       string s;
       getline(data, s);
       return s;
   }
   
   template <typename T> void from_stream(T &t) {
       stringstream ss(next_line());
       ss >> t;
   }
   
   void from_stream(string &s) {
       s = next_line();
   }
   
   template <typename T>
   string to_string(T t) {
       stringstream s;
       s << t;
       return s.str();
   }
   
   string to_string(string t) {
       return "\"" + t + "\"";
   }
   
   bool do_test(string code, string message, string __expected) {
       time_t startClock = clock();
       BreakingTheCode *instance = new BreakingTheCode();
       string __result = instance->decodingEncoding(code, message);
       double elapsed = (double)(clock() - startClock) / CLOCKS_PER_SEC;
       delete instance;
   
       if (__result == __expected) {
           cout << "PASSED!" << " (" << elapsed << " seconds)" << endl;
           return true;
       }
       else {
           cout << "FAILED!" << " (" << elapsed << " seconds)" << endl;
           cout << "           Expected: " << to_string(__expected) << endl;
           cout << "           Received: " << to_string(__result) << endl;
           return false;
       }
   }
   
   int run_test(bool mainProcess, const set<int> &case_set, const string command) {
       int cases = 0, passed = 0;
       while (true) {
           if (next_line().find("--") != 0)
               break;
           string code;
           from_stream(code);
           string message;
           from_stream(message);
           next_line();
           string __answer;
           from_stream(__answer);
   
           cases++;
           if (case_set.size() > 0 && case_set.find(cases - 1) == case_set.end())
               continue;
   
           cout << "  Testcase #" << cases - 1 << " ... ";
           if ( do_test(code, message, __answer)) {
               passed++;
           }
       }
       if (mainProcess) {
           cout << endl << "Passed : " << passed << "/" << cases << " cases" << endl;
           int T = time(NULL) - 1438865246;
           double PT = T / 60.0, TT = 75.0;
           cout << "Time   : " << T / 60 << " minutes " << T % 60 << " secs" << endl;
           cout << "Score  : " << 250 * (0.3 + (0.7 * TT * TT) / (10.0 * PT * PT + TT * TT)) << " points" << endl;
       }
       return 0;
   }
   
   int main(int argc, char *argv[]) {
       cout.setf(ios::fixed, ios::floatfield);
       cout.precision(2);
       set<int> cases;
       bool mainProcess = true;
       for (int i = 1; i < argc; ++i) {
           if ( string(argv[i]) == "-") {
               mainProcess = false;
           } else {
               cases.insert(atoi(argv[i]));
           }
       }
       if (mainProcess) {
           cout << "BreakingTheCode (250 Points)" << endl << endl;
       }
       return run_test(mainProcess, cases, argv[0]);
   }
   // CUT end