Mercurial > defical

annotate defical-c/src/backtrack.cpp @ 0:ebed2bd0d300

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Initial import from svn. History be damned.
author Edho P. Arief <me@myconan.net>
date Fri, 02 Apr 2010 23:11:57 +0700
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children
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ebed2bd0d300 Initial import from svn. History be damned.
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1 #include "backtrack.h"
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2
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3 namespace bt{
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4 backtrack::backtrack() {}
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5
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6 backtrack::backtrack(uint32_t graphType,uint32_t numVer,uint32_t numDef,uint32_t firstLabel,bool isAll)
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7 {
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8 this->theGraph=new semtd(graphType,numVer,numDef);
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9 this->graphType=graphType;
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10 this->usedLabels.resize(this->theGraph->TotalVer+1,false);
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11 this->IsSemt=false;
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12 setLabel(1,firstLabel);
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13 this->firstLabel=firstLabel;
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14 this->Result="";
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15 this->RecurseAll=isAll;
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16 this->pathLabel=this->startPath=this->endPath=0;
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17 switch(graphType)
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18 {
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19 case 4:
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20 {
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21 this->startPath=2;
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22 this->endPath=this->theGraph->NumVer;
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23 break;
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24 }
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25 case 3:
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26 case 5:
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27 {
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28 this->startPath=3;
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29 this->endPath=this->theGraph->NumVer;
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30 break;
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31 }
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32 }
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33 }
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34
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35 inline void backtrack::setLabel(uint32_t verPos,uint32_t verLabel)
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36 {
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37 this->usedLabels[verLabel]=true;
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38 this->theGraph->SetVerLabel(verPos,verLabel);
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39 }
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40
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41 inline void backtrack::removeLabel(uint32_t verPos)
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42 {
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43 this->usedLabels[this->theGraph->VerLabels[verPos]]=false;
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44 this->theGraph->RemoveVerLabel(verPos);
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45 }
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46
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47 void backtrack::walk(uint32_t currentLevel)
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48 {
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49 if (this->IsProcessing)
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50 {
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51 if (currentLevel > this->theGraph->NumVer)
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52 {
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53 if (this->theGraph->IsSemt())
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54 {
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55 if(!this->RecurseAll)
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56 {
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57 this->IsProcessing = false;
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58 }
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59 this->Result += this->theGraph->Print(1);
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60 //setDual();
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61 //this->Result+="\nDual:\n"+this->theGraph->Print()+"\n";
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62 //setDual(); //undo the damage
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63 this->IsSemt = true;
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64 }
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65 removeLabel(currentLevel - 1);
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66 }
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67 else
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68 {
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69 //List<int> availableLabels = new List<int>();
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70 vector<uint32_t> availableLabels;
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71 uint32_t start=1;
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72 uint32_t end=this->theGraph->TotalVer;
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73 if(currentLevel==2 && this->firstLabel != this->theGraph->TotalVer)
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74 {
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75 if(this->graphType==3)
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76 start=end; //optimization for wheel
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77 else if(this->graphType==5)
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78 start=this->firstLabel+1;
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79 }
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80 else if(this->startPath!=0)
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81 {
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82 if(currentLevel==this->endPath)
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83 start=this->pathLabel+1; //remove possibility for reversed path labeling
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84 else if(currentLevel==this->startPath && start<end)
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85 end=this->theGraph->TotalVer-1; //no need to test last label as it'll be checked already on all previous cases
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86 }
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87 for (uint32_t i = start; i <= end; i++)
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88 if (!this->usedLabels[i])
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89 availableLabels.push_back(i);
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90 if(availableLabels.size()>0)
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91 {
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92 for (int32_t x = availableLabels.size()-1; x >= 0; x--)
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93 {
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94 if((this->startPath!=0) && (currentLevel==this->startPath))
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95 this->pathLabel=availableLabels[x];
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96 if (this->theGraph->IsValidToLabel(currentLevel, availableLabels[x]))
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97 {
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98 setLabel(currentLevel,availableLabels[x]);
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99 walk(currentLevel + 1);
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100 }
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101 if (!this->IsProcessing)
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102 break;
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103 }
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104 }
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105 if (currentLevel != 2) { removeLabel(currentLevel - 1); }
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106 }
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107 }
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108 }
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109 void backtrack::Walk()
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110 {
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111 if(this->theGraph->numDef>=this->theGraph->MinDef())
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112 {
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113 this->IsProcessing=true;
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114 walk(2);
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115 }
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116 else
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117 {
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118 this->IsSemt=false;
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119 }
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120 }
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121 }