http://hihocoder.com/problemset/problem/1081
1 #include <iostream> 2 #include <stdio.h> 3 #include <vector> 4 using namespace std; 5 const int maxn = 1e3+10; 6 int n, m, a, b, c, map[maxn][maxn], num[maxn]; 7 vector<int> T[maxn]; 8 void dfs(int x, int sum){ 9 if(num[x] == 0 || num[x] > sum) num[x] = sum; 10 else return ; 11 for(int i =0; i < T[x].size(); i++){ 12 dfs(T[x][i], sum + map[x][T[x][i]]); 13 } 14 } 15 int main(){ 16 scanf("%d %d", &n, &m); 17 for(int i = 0; i < n; i++){ 18 scanf("%d %d %d", &a, &b, &c); 19 if(!map[a][b]){ 20 T[a].push_back(b); 21 T[b].push_back(a); 22 map[a][b] = map[b][a] = c; 23 } 24 else map[a][b] = map[b][a] = min(map[a][b] , c); 25 } 26 dfs(1, 0); 27 printf("%d\n", num[m]); 28 return 0; 29 }
http://hihocoder.com/problemset/problem/1089
1 #include <iostream> 2 #include <stdio.h> 3 #include <vector> 4 using namespace std; 5 const int maxn = 1e3+10; 6 int n, m, a, b, c, map[maxn][maxn], map2[maxn][maxn]; 7 vector<int> T[maxn]; 8 void dfs(int start, int x, int sum){ 9 if(map2[start][x] == 0 || map2[start][x] > sum) map2[start][x] = sum; 10 else return ; 11 for(int i =0; i < T[x].size(); i++){ 12 dfs(start, T[x][i], sum + map[x][T[x][i]]); 13 } 14 } 15 int main(){ 16 scanf("%d %d", &n, &m); 17 for(int i = 0; i < m; i++){ 18 scanf("%d %d %d", &a, &b, &c); 19 if(!map[a][b]){ 20 T[a].push_back(b); 21 T[b].push_back(a); 22 map[a][b] = map[b][a] = c; 23 } 24 else map[a][b] = map[b][a] = min(map[a][b] , c); 25 } 26 for(int i = 1; i <= n; i++) 27 dfs(i, i, 0), map2[i][i] = 0; 28 for(int i = 1; i <= n; i++){ 29 for(int j = 1; j <= n; j++){ 30 if(j!=n) 31 printf("%d ", map2[i][j]); 32 else 33 printf("%d\n", map2[i][j]); 34 } 35 } 36 return 0; 37 }
只有不断学习才能进步!
原文:https://www.cnblogs.com/wenbao/p/5895911.html