add solution for nbcontest, progra, n°6

This commit is contained in:
Wilfried OLLIVIER 2014-11-22 23:57:27 +01:00
parent 5b0f4aa468
commit 8323c13b24

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@ -0,0 +1,235 @@
#!/usr/bin/env perl
# uses #########################################################################
use diagnostics;
use warnings;
use strict;
# Modules
# database
use DBI;
# http
use LWP::UserAgent;
use HTTP::Cookies;
# subs #########################################################################
# extract cookie from SQLite db
sub extract_cookie
{
# shift db_path
my $db_path = shift;
# variables usefull for database connection and handler
my $dbh;
my $sth;
my $rv;
my @row;
# string containing the query
my $query;
# connect to the db
$dbh = DBI->connect("dbi:SQLite:dbname=$db_path","","") or die $DBI::errstr;
# prepare the query
$query = "SELECT name, value FROM moz_cookies WHERE host LIKE\
'%newbiecontest.org%' AND name LIKE '%SMFCookie%'";
$sth = $dbh->prepare($query);
# execute
$rv = $sth->execute() or die $DBI::errstr;
# fetch the only row found
@row = $sth->fetchrow_array();
# close the database
$sth->finish();
$dbh->disconnect();
return $row[0], $row[1];
}
# Send http request
sub send_request
{
# shift args
my ($cookie_name, $cookie_val, $url) = @_;
# create variables
my $ua = LWP::UserAgent->new;
my $cookies = HTTP::Cookies->new();
# create the cookie
$cookies->set_cookie(0, $cookie_name, $cookie_val, '/', 'newbiecontest.org', 80, 0, 0,\
0, 0);
# add the cookie to the jar
$ua->cookie_jar($cookies);
# send request
my $response = $ua->get($url);
return $response->decoded_content;
}
# solve equation
sub solve_equation
{
# shift equation
my $equation = shift;
# variables
my $delta;
my $x1;
my $x2;
my $sol;
my $sol_trunc;
print("\n" . $equation . "\n");
# calcul delta
($delta, $a, $b) = delta($equation);
# if it's < 0, no solution
if ($delta < 0) {
print("\t There is no solution...\n");
exit;
}
# if delta == 0
if ($delta == 0) {
$sol = - $b / (2 * $a);
}
# else (delta > 0), 2 solutions
else {
# calcul x1 and x2
$x1 = - ($b - sqrt($delta)) / (2 * $a);
$x2 = - ($b + sqrt($delta)) / (2 * $a);
# determine the one who is valid for the answer of the challenge
if ($x1 > $x2) {
$sol = $x1;
}
else {
$sol = $x2;
}
}
# truncate (2 decimals)
$sol_trunc = (int ($sol * 100));
$sol_trunc /= 100;
# return the solution
return $sol_trunc;
}
# calcul delta
sub delta
{
# variables
my $delta;
my $a;
my $b;
my $c;
# shift the equation
my $equation = shift;
# funny time
print("\t Regex time boy !\n");
# regex
$equation =~ m/(\d*)x. (.) (\d*)x (.) (\d*)/;
print("\t Regex time is done ! Well done\n");
# reorder all the coefficients
$a = $1;
if ($a eq "") {
$a = 1;
}
$b = $3;
if ($3 eq "") {
$b = 1;
}
if ($2 eq "-") {
$b *= -1;
}
$c = $5;
if ($c eq "") {
$c = 0;
}
if ($4 eq "-") {
$c *= -1;
}
# calcul delta
$delta = $b * $b - 4 * $a * $c;
# return needed values
return $delta, $a, $b;
}
# send answer
sub send_answer
{
my ($cookie_name, $cookie_val, $url, $result) = @_;
# create variables
my $ua = LWP::UserAgent->new;
my $cookies = HTTP::Cookies->new();
# modify the url
$url = $url . "?solution=" . $result;
# create the cookie
$cookies->set_cookie(0, $cookie_name, $cookie_val, '/', 'newbiecontest.org', 80, 0, 0,\
0, 0);
# add the cookie to the jar
$ua->cookie_jar($cookies);
# send request
my $response = $ua->get($url);
print $response->decoded_content;
}
# main #########################################################################
# check argument number
if (@ARGV != 3) {
print("Get. The. Fuck. Out\n");
print("[i] Usage : ./2nd_degre.pl cookie.db url_in url_out\n");
exit;
}
my $cookie_name;
my $cookie_val;
my $equation;
my $result;
($cookie_name, $cookie_val) = extract_cookie($ARGV[0]);
$equation = send_request($cookie_name, $cookie_val, $ARGV[1]);
$result = solve_equation($equation);
send_answer($cookie_name, $cookie_val, $ARGV[2], $result);
print("Done.\n");