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1 | //Author Antonio-Gabriel Sturzu |
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2 | |
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3 | #include<stdio.h> |
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4 | #include<vector> |
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5 | #include<string.h> |
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6 | #include<time.h> |
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7 | #define pb push_back |
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8 | #define mp make_pair |
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9 | #define inf 1001 |
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10 | |
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11 | using namespace std; |
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12 | |
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13 | int main() |
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14 | { |
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15 | int n,m,a,b,c,cost=0,prev[200001],key[200001],i,min=0,imin=0; |
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16 | vector< pair<int,int> > v[200001]; |
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17 | char viz[200001]; |
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18 | clock_t time1,time2; |
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19 | FILE *f=fopen("apm.in","r"); |
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20 | |
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21 | fscanf(f,"%i%i",&n,&m); |
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22 | for(i=0;i<m;i++) |
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23 | { |
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24 | fscanf(f,"%i%i%i",&a,&b,&c); |
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25 | v[a].pb(mp(b,c)); |
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26 | v[b].pb(mp(a,c)); |
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27 | } |
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28 | fclose(f); |
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29 | |
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30 | memset(viz,0,sizeof(viz)); |
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31 | time1=clock(); |
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32 | key[1]=0; |
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33 | for(i=2;i<=n;i++) |
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34 | key[i]=inf; |
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35 | |
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36 | for(;;) |
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37 | { |
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38 | min=inf; |
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39 | for(i=1;i<=n;i++) |
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40 | { |
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41 | if(viz[i]==0 && key[i]<min) |
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42 | { |
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43 | min=key[i]; |
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44 | imin=i; |
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45 | } |
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46 | } |
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47 | if(min==inf) |
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48 | break; |
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49 | viz[imin]=1; |
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50 | cost+=min; |
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51 | for(i=0;i<(int) v[imin].size();i++) |
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52 | { |
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53 | if(viz[v[imin][i].first]==0 && v[imin][i].second<key[v[imin][i].first]) |
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54 | { |
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55 | prev[v[imin][i].first]=imin; |
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56 | key[v[imin][i].first]=v[imin][i].second; |
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57 | } |
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58 | } |
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59 | } |
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60 | time2=clock(); |
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61 | printf("Au trecut %f secunde \n",(double)(time2-time1)/CLOCKS_PER_SEC); |
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62 | f=fopen("apm.out","w"); |
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63 | fprintf(f,"%i\n",cost); |
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64 | fprintf(f,"%i\n",n-1); |
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65 | for(i=2;i<=n;i++) |
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66 | fprintf(f,"%i %i\n",prev[i],i); |
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67 | fclose(f); |
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68 | return 0; |
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69 | } |
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