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[129] | 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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