Minimum Transport Cost
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 8794 Accepted Submission(s): 2311
The cost of the transportation on the path between these cities, and
a certain tax which will be charged whenever any cargo passing through one city, except for the source and the destination cities.
You must write a program to find the route which has the minimum cost.
The data of path cost, city tax, source and destination cities are given in the input, which is of the form:
a11 a12 ... a1N
a21 a22 ... a2N
...............
aN1 aN2 ... aNN
b1 b2 ... bN
c d
e f
...
g h
where aij is the transport cost from city i to city j, aij = -1 indicates there is no direct path between city i and city j. bi represents the tax of passing through city i. And the cargo is to be delivered from city c to city d, city e to city f, ..., and
g = h = -1. You must output the sequence of cities passed by and the total cost which is of the form:
Path: c-->c1-->......-->ck-->d
Total cost : ......
......
From e to f :
Path: e-->e1-->..........-->ek-->f
Total cost : ......
Note: if there are more minimal paths, output the lexically smallest one. Print a blank line after each test case.
0 3 22 -1 4
3 0 5 -1 -1
22 5 0 9 20
-1 -1 9 0 4
4 -1 20 4 0
5 17 8 3 1
1 3
3 5
2 4
-1 -1
0
Path: 1-->5-->4-->3
Total cost : 21
From 3 to 5 :
Path: 3-->4-->5
Total cost : 16
From 2 to 4 :
Path: 2-->1-->5-->4
Total cost : 17
Asia 1996, Shanghai (Mainland China)
#include<stdio.h>
#include<string.h>
#define M 500
#define inf 0x3f3f3f3f
int dis[M][M],b[M],n,re[M][M];//re记录一条边的后驱
void floyd(){
for(int k=1;k<=n;k++)
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++){
if(dis[i][j] > dis[i][k]+dis[k][j]+b[k]){//注意加上这个城市的值
dis[i][j] = dis[i][k]+dis[k][j]+b[k];
re[i][j] = re[i][k];
}else{
if(dis[i][j] == dis[i][k]+dis[k][j]+b[k] && re[i][j]>re[i][k])//当路径相等的时候按字典序选择)
re[i][j] = re[i][k];
}
}
}
int main(){
int i,j,x,y;
while(~scanf("%d",&n),n){
memset(re,0,sizeof(re));
for(i=1;i<=n;i++)
for(j=1;j<=n;j++){
scanf("%d",&dis[i][j]);
if(dis[i][j]==-1)
dis[i][j]=inf;
re[i][j]=j;
}
for(i=1;i<=n;i++)
scanf("%d",&b[i]);
floyd();
while(scanf("%d%d",&x,&y),(x!=-1||y!=-1)){
printf("From %d to %d :\nPath: %d",x,y,x);
int u=x,v=y;
while(u!=v){
printf("-->%d",re[u][v]);
u=re[u][v];
}
printf("\nTotal cost : %d\n\n", dis[x][y]);
}
}
return 0;
}