题目链接:http://poj.org/problem?id=1258
标准prim题,无变化,利用简单prim算法解决,先开始WA了一次,后来发现这题,是多数据输入的,修改了个while循环过了!
代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
|
#include <iostream> #include <cstdio> #include <cstring> #include <algorithm> using namespace std; #define MAX 105 #define INF 0xFFFFF
int prim(int graph[][MAX], int n) { int lowcost[MAX],mst[MAX]; int i, j, min, minid, sum = 0; for (i = 2; i <= n; i++) { lowcost[i] = graph[1][i]; mst[i] = 1; } mst[1] = 0; for (i = 2; i <= n; i++) { min = INF; minid = 0; for (j = 2; j <= n; j++) { if (lowcost[j] < min && lowcost[j] != 0) { min = lowcost[j]; minid = j; } } sum += min; lowcost[minid] = 0; for (j = 2; j <= n; j++) { if (graph[minid][j] < lowcost[j]) { lowcost[j] = graph[minid][j]; mst[j] = minid; } } } return sum; }
int main() { int i,j,n,map[MAX][MAX]; while(cin>>n) { for(i=1;i<=n;i++) for(j=1;j<=n;j++) cin>>map[i][j]; cout<<prim(map,n)<<endl; } }
|