c - if statement and puts() -


recently have across solution on codeforces site. couldn't understand condition in if statement , condition of ternary operator in question can please me ? 

#include<stdio.h>  int main(void) {     int a[1000]={0},ans,k;     while((k=getchar())!='\n'){       if(!a[k]){           ans++;           a[k]=1;       }     }     puts(ans&1 ? "ignore him!":"chat her!");     return 0; }

it's bizarre piece of code, i'm not sure entirely why it's easy enough understand technical viewpoint (i.e., what does).

the while loop gets series of characters standard input and, each unique one, adds 1 ans variable. expression !a[k] true if a[k] 0 (they're initialised state).

when condition true, ans incremented , a[k] set 1, meaning more characters of value not affect outcome (the condition won't ever true again).

in terms of if statement, expression ans&1 true if ans odd (has lower-order bit set).

so appears tells ignore people have odd number of unique characters in names , talk others. of course, whole thing falls apart since don't initialise ans, meaning can arbitrary value (not zero) , program therefore pretty able tell whatever wants.

once you've fixed little issue, i'll happy chat further - paxdiablo has 8 unique characters. should warn in advance though, i'm not "her" :-)


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

c# - Retrieve google contact -

i'm using .net retrieve contact info google contact. however, retrieves including sent email not stored in contact. there anyway can retrieve contact contact? here code requestsettings rs = new requestsettings("", email, password); rs.autopaging = true; contactsrequest cr = new contactsrequest(rs); feed<contact> contacts = cr.getcontacts(); foreach (contact contact in contacts.entries) { name name = contact.name; response.write(name.givenname + " " + name.familyname + "<br/>"); foreach (email emailid in contact.emails) { response.write(emailid.address + "<br/>"); } response.write("<br/>"); } im using google.gdata.contacts package nuget v 2.2.0 string redirecturi = "urn:ietf:wg:oauth:2.0:oob"; // build base oauth2 parameters var oauth2
Read more

javascript - How to insert selected radio button value into table cell -

i have 5 radio buttons <input type="radio" id="rating">1 <input type="radio" id="rating2">2 <input type="radio" id="rating3">3 <input type="radio" id="rating4">4 <input type="radio" id="rating5">5 i have 1 table <table id="mytabledata" border="1" style="width:100%"> <tr id="templaterow"> <th>ratings</th> </tr> </table> one add button <input type="button" id="add" value="add" onclick="addradiovalue()"> i've written code dynamically add rows table, when select radio button , click on add button, value of selected radio button should inserted new cell within table ratings. i able thing text box, i'm not able radio button. can me? your problems didn't have name set on radios , tryi
Read more