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POmy solution for (3n+1) is exceeding 3 sec time limit
 

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  1. POmy solution for (3n+1) is exceeding 3 sec time limit
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    <p>here i have written a program on (3n+1) problem.it's also a problem from UVa. I believe it's a known problem.but when i am going to submit it in that online judge community it is sending me a <strong>Time Exceeding Error</strong>. the time limit is 3 sec. I have done what my little knowledge can do. If anyone can help me with some more advice I would be glad. my code is:</p> <pre><code>#include &lt;iostream&gt; #include&lt;stdlib.h&gt; #include&lt;stdio.h&gt; using namespace std; int main() { int loop=1; unsigned short *cyclelength; while(loop=1){ unsigned int x,y,i,j,num,count=0,p,k,c,max; for(;;){ cout&lt;&lt;"enter two integers. they must not be equal and must be between 1 and 1000000\n"; while(!(cin&gt;&gt;i&gt;&gt;j)){ cout&lt;&lt;"please enter a number\n"; cin.clear(); cin.ignore(1000,'\n'); } if(i&gt;=1 &amp;&amp; i&lt;1000000 &amp;&amp; j&gt;=1 &amp;&amp; j&lt;1000000 &amp;&amp; i!=j){ break; } else{ printf("try the whole process again\n"); } } if(i&gt;j){ x=i; y=j; } else{ x=j; y=i; }/*making x always greater than y*/ cyclelength=(unsigned short *)malloc(1000000 *sizeof(unsigned short)); if (NULL==cyclelength){ printf("process aborted"); return 0; } else{ /*solution part for the range of number. and solution for each number put into cyclelength.*/ num=y; while(num&lt;=x){ p=1; k=num; while(k!=1){ if(k%2==0) k=k/2; else k=3*k+1; p+=1; } cyclelength[count]=p; num+=1; count+=1; } c=0; max=cyclelength[c]; for(c=0;c&lt;x-y-1;c+=1){ if(max&lt;cyclelength[c+1]){ max=cyclelength[c+1]; } } free(cyclelength); cyclelength = NULL; cout&lt;&lt;i&lt;&lt;" "&lt;&lt;j&lt;&lt;" "&lt;&lt;max&lt;&lt;'\n'; } } } </code></pre>
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    1. USNasif Imtiaz Ohi
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      1. POmy solution for (3n+1) is exceeding 3 sec time limit
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      1. VTUpMod
    1. COHave you run the program? It certainly looks like you infinitely loop in your outer `while` to me. You never exit.
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      1. USDavid
    2. CO`while(loop=1){` this doesn't do what you think it does.
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      1. USOmnipotentEntity
    3. COWhile I do know the [Collatz conjecture](http://en.wikipedia.org/wiki/Collatz_conjecture), it is not obvious what your code is supposed to do.
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      1. UStiwo
 

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