hdu-2544 最短路---模板题
题目链接:
http://acm.hdu.edu.cn/showproblem.php?pid=2544
题目大意:
1-N的最短路长度
解题思路:
dijkstra模板
1 #include<bits/stdc++.h> 2 using namespace std; 3 typedef long long ll; 4 const int maxn = 100 + 10; 5 const int INF = 0x3f3f3f3f; 6 int Map[maxn][maxn]; 7 int v[maxn], d[maxn]; 8 int n, m; 9 void dijkstra(int u) 10 { 11 memset(v, 0, sizeof(v)); 12 for(int i = 0; i <= n; i++)d[i] = (i == u ? 0 : INF); 13 for(int i = 0; i < n; i++) 14 { 15 int x, m = INF; 16 for(int j = 1; j <= n; j++)if(!v[j] && d[j] <= m)m = d[x = j]; 17 v[x] = 1; 18 for(int j = 1; j <= n; j++) 19 { 20 if(d[j] > d[x] + Map[x][j]) 21 { 22 d[j] = d[x] + Map[x][j]; 23 } 24 } 25 } 26 cout<<d[n]<<endl; 27 } 28 int main() 29 { 30 while(cin >> n >> m && n) 31 { 32 int u, v, w; 33 memset(Map, INF, sizeof(Map)); 34 while(m--) 35 { 36 cin >> u >> v >> w; 37 Map[u][v] = Map[v][u] = w; 38 } 39 dijkstra(1); 40 } 41 }
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