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PO10341 - Solve It WA
 

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  1. PO10341 - Solve It WA
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    <p>I was working on this problem from the ACM Uva webpage, and I've tried every single input from the forums, and it works perfectly. It keeps giving me "Wrong answer", and as I'm not an english speaker, maybe I'm forgetting something. Maybe someone from here had submitted this solution. This is the 5th submit I've made from this problem and it's always wrong. Thanks a lot. EDIT:</p> <p>Solve the equation:</p> <blockquote> <blockquote> <p>p*e-x + q*sin(x) + r*cos(x) + s*tan(x) + t*x2 + u = 0</p> <p>where 0 &lt;= x &lt;= 1.</p> </blockquote> </blockquote> <p>Input</p> <p>Input consists of multiple test cases and terminated by an EOF. Each test case consists of 6 integers in a single line: p, q, r, s, t and u (where 0 &lt;= p,r &lt;= 20 and -20 &lt;= q,s,t &lt;= 0). There will be maximum 2100 lines in the input file.</p> <p>Output</p> <p>For each set of input, there should be a line containing the value of x, correct upto 4 decimal places, or the string "No solution", whichever is applicable.</p> <pre><code>#include &lt;math.h&gt; #include &lt;stdio.h&gt; #define eps 0.00001 int p, q, r,s,t,u; long double fdex(long double x) { long double res=p*exp(-x)+ q*sin(x)+r*cos(x)+s*tan(x)+t*x*x+u; return res; } int main() { freopen("input.txt","rt",stdin); freopen("output.txt","wt",stdout); long double x,inf,sup,fx; while(scanf("%d %d %d %d %d %d\n",&amp;p, &amp;q, &amp;r,&amp;s,&amp;t,&amp;u)!=EOF) { long double x1; inf=0.0; sup=1.0; if (p==0 &amp;&amp; q==0 &amp;&amp; r==0 &amp;&amp; s==0 &amp;&amp; t==0) printf("0.0000\n"); else if((fdex(inf)*fdex(sup)&gt;0.0)) printf("No solution\n"); else { do { x=(inf+sup)/2.0; fx=fdex(x); if(fx&gt;eps) { inf=x; } else if(fx&lt;-eps) { sup=x; } }while( fx&lt;-eps || fx&gt;eps); printf("%.4llf\n",x); } } } </code></pre> <p><a href="http://uva.onlinejudge.org/index.php?option=com_onlinejudge&amp;Itemid=8&amp;category=24&amp;page=show_problem&amp;problem=1282" rel="nofollow">Problem</a></p>
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    1. USGiuseppe
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    1. COI recommend _against_ using `freopen` to create new `stdin` and `stdout`. As it is now you can't really print debugging statements that might show whats wrong. Using normal file handles instead (or even better, streams, as you are doing it in C++) is not that hard or more work really.
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      1. PO10341 - Solve It WA
      1. USSome programmer dude
    2. COIf output needs to come in lines, something as silly as a redundant empty line at the end of input can make your submission WA on Uva. For example, `for (int i = 0; i < ARRAYSIZE; ++i) cout << arr[i] << '\n';` may not work. You need additional check to not print `'\n'` after the last line. Stupid IMO, but that's how it is...
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      1. USjrok
    3. COCan you tell us your idea and why you think it's correct and should work? You seem to be doing a binary search - why do you think this is the correct solution in the first place? For example, `sin` is increasing in `[0, 1]`, but `cos` is decreasing. Are you sure you can just binary search it like that?
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      1. PO10341 - Solve It WA
      1. USIVlad
 

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