hdu1233 prim
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1 #include <iostream> 2 #include <memory.h> 3 #include <cstdio> 4 using namespace std; 5 6 const int MAX = 1<<20; 7 const int N = 111; 8 int mp[N][N]; 9 int lowcost[N]; 10 int vis[N]; 11 int n, ans; 12 13 void prim() 14 { 15 int i,j,pos,Min; 16 for (i = 1;i <= n; ++ i) 17 lowcost[i] = mp[1][i]; 18 vis[1] = 1; 19 for (i = 1;i <= n; ++ i) { 20 Min = MAX; 21 for (j = 1;j <= n; ++ j) { 22 if (Min > lowcost[j] && !vis[j]) 23 { 24 pos = j; 25 Min = lowcost[j]; 26 } 27 } 28 vis[pos] = 1; 29 for (j = 1 ;j <= n; ++ j) 30 if (!vis[j] && mp[pos][j] < lowcost[j]) 31 lowcost[j] = mp[pos][j]; 32 } 33 for (j = 1;j <= n;++ j) //因为mp[1][1] = 0 34 ans += lowcost[j]; 35 } 36 37 void init() 38 { 39 memset(lowcost,0,sizeof(lowcost)); 40 memset(vis,0,sizeof(vis)); 41 for (int i = 0;i <= n; ++ i) 42 for (int j = 0;j <= n;++ j) { 43 mp[i][j] = MAX; 44 if (i == j) 45 mp[i][j] = 0; 46 } 47 } 48 49 50 int main() 51 { 52 while (~scanf("%d",&n),n) 53 { 54 init(); 55 int m = n*(n-1)/2; 56 for (int i = 0;i < m; ++ i) 57 { 58 int a,b,c; 59 scanf("%d%d%d",&a,&b,&c); 60 if (mp[a][b] > c) 61 mp[a][b] = mp[b][a] = c; 62 } 63 ans = 0; 64 prim(); 65 cout << ans << endl; 66 } 67 return 0; 68 }
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