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Home » Compete » September 2009 (Contest VIII) » Chemical reactions

Chemical reactions

Problem code: G5

  • All Submissions

All submissions for this problem are available.

Johnny is preparing a chemical experiment for school. The experiment involves a certain number of different liquid chemical substances which have been mixed together and are currently reacting with each other. There are n different types of liquid substances. However, each substance appears in k different variants called isomers, and Johnny cannot distinguish between the different isomers...

We can assume that time is discrete and measured in minutes. During each minute, each possible reaction is described as follows: a b ratio type, meaning that ratio of liquid a (i.e., part of total amount, no matter which isomer) transforms into liquid b. If the reaction type is normal, then isomer i of liquid a transforms into isomer i of liquid b. If reaction type is special, then isomer i transforms into isomer i+1.

At time 0, each substance is in its initial isomer form, having number 1. For the special threshold value k, once isomer k of any substance passes through a special reaction, it transforms into solid state matter and precipitates from the mixure, no longer taking part in reactions (so, for all practical purposes, we can say it disappears). Moreover, during each minute, a small part of each liquid disappears (transforms into gaseous state and evaporates). From Johnny's point of view, the evaporation happens just before the reactions in any given minute.

Starting from time 0, exactly once a minute, Johnny takes note of the amount of each liquid in the mixture. He does this for a very, very long time, and then he sums the obtained amounts for each liquid (i.e., for each liquid, he adds the amount there was at time 0, at time 1, at time 2, etc.). The resulting n numbers are the result of the experiment. However, Johnny would like to know the results of experiment beforehand, so he asks you for a little help. Compute the results of his experiment, knowing that initially he just mixes the same amount (1 unit) of isomer 1 of each substance.

Input

First, 1≤n≤100, then 1≤k≤1000. Then, n floating point numbers follow, describing the proportion of liquid of each type that evaporates in each minute. Then, one integer m, the number of reactions, followed by m reaction definitions. Each definition consists of integers 0≤a<n, 0≤b<n, floating point 0<r≤1, and integer s=0 or 1, meaning that part r of the total amount of liquid a transforms into liquid b every minute (in the normal way if s=0, and in a special reaction, otherwise). No two pairs (a,b) are the same between definitions, i.e., always a != b.

Output

Exactly n numbers, representing the measured results of the experiment for each substance. Precision up to at least 6 digits after the decimal point is required.

Example

Input:
2
10
0.1 0.1
2
0 1 0.5 1
1 0 0.5 1

Output:
8.6556936725 8.6556936725 

Author: admin
Date Added: 15-08-2009
Time Limit: 5 sec
Source Limit: 50000 Bytes
Languages: ADA, ASM, BASH, BF, C, C99 strict, CAML, CLOJ, CLPS, CPP 4.0.0-8, CPP 4.3.2, CS2, D, F#, FORT, GO, HASK, ICK, ICON, JAR, JAVA, JS, LISP clisp, LISP sbcl, LUA, NEM, NICE, PAS fpc, PAS gpc, PERL, PHP, PIKE, PRLG, PYTH, PYTH 3.1.2, RUBY, SCALA, SCM guile, SCM qobi, ST, TEXT, WSPC


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Comments

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Are the answers guaranteed to

narri @ 2 Sep 2009 05:42 AM

Are the answers guaranteed to be finite?

When will the experiment end?

fushar @ 2 Sep 2009 01:19 PM

When will the experiment end? After all liquid substances disappear? Or am I missing something?

@Chris Could you be more

admin @ 2 Sep 2009 01:49 PM

@Chris Could you be more specific ?

@Ashar This is explained in the problem statement.

If some of the evaporation

triplem @ 2 Sep 2009 04:54 PM

If some of the evaporation values are 0, the amount of liquid of some type may never decrease, thus causing an infinite sum. I presume that won't happen though.

The sum won't be infinite.

admin @ 2 Sep 2009 04:55 PM

The sum won't be infinite.

For the special threshold

neoanderson @ 7 Sep 2009 02:06 PM

For the special threshold value k, once isomer k of any substance passes through a special reaction, it transforms into solid state matter.

 

what is this threshold value of?  of time, of quantity, of what?

 

 

The isomer number

admin @ 7 Sep 2009 02:27 PM

The isomer number

What happens if a liquid is

braineater @ 7 Sep 2009 06:55 PM

What happens if a liquid is transformed by two different reactions. Eg. a -> b  and  a -> c. If the ratios of the two reactions are r1 and r2, how much of liquid a gets transformed and how much of b and c are formed in one step?

What happens if a liquid is

braineater @ 7 Sep 2009 06:55 PM

What happens if a liquid is transformed by two different reactions. Eg. a -> b  and  a -> c. If the ratios of the two reactions are r1 and r2, how much of liquid a gets transformed and how much of b and c are formed in one step?

The values of b and c depend

admin @ 7 Sep 2009 07:02 PM

The values of b and c depend on the value of a in the previous step and not on each other.

Suppose the ratios of the two

braineater @ 7 Sep 2009 08:06 PM

Suppose the ratios of the two reactions are 0.5 and 0.75. Then, what quantity of 'a' will be left after one minute?

Or can we assume that the sum of ratios of reactions having the same source will not exceed 1?

Yes.

admin @ 7 Sep 2009 08:52 PM

Yes.

 @admin: Please check judge

tanaeem @ 9 Sep 2009 09:43 PM

 @admin: Please check judge Data, I have got AC after changing "long double" to "double", which suggests something wrong with judge data.

there always will be problems

izulin @ 10 Sep 2009 02:49 AM

there always will be problems with precision...

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