标签：bfs
因为要花费最少，如果花费最少的有多个还要使得步数最少
所以在判断一个数字要不要入队列的时候只要判断这个就可以了
Description
There is an interesting calculator. It has 3 rows of buttons.
Row 1: button 0, 1, 2, 3, ..., 9. Pressing each button appends that digit to the end of the display.
Row 2: button +0, +1, +2, +3, ..., +9. Pressing each button adds that digit to the display.
Row 3: button *0, *1, *2, *3, ..., *9. Pressing each button multiplies that digit to the display.
Note that it never displays leading zeros, so if the current display is 0, pressing 5 makes it 5 instead of 05. If the current display is 12, you can press button 3, +5, *2 to get 256. Similarly, to change the display from 0 to 1, you can press 1 or +1 (but not both!).
Each button has a positive cost, your task is to change the display from x to y with minimum cost. If there are multiple ways to do so, the number of presses should be minimized.
Input
There will be at most 30 test cases.The first line of each test case contains two integers x and y(0<=x<=y<=105).Each of the 3 lines contains10 positive integers (not greater than 105), i.e. the costs of each button.
Output
For each test case, print the minimal cost and the number of presses.
Sample Input
12 2561 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 112 256100 100 100 1 100 100 100 100 100 100100 100 100 100 100 1 100 100 100 100100 100 10 100 100 100 100 100 100 100
Sample Output
Case 1: 2 2Case 2: 12 3
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <limits.h>
#include <ctype.h>
#include <string.h>
#include <string>
#include <queue>
#include <stack>
#include <deque>
#include <algorithm>
#include <iostream>
#include <math.h>
#include <map>
using namespace std;
#define MAXN 100000 + 100
#define INF 999999999
int cost[MAXN];
int con[MAXN];
int num[15][15];
int x,y;
int cas=1;
void BFS(){
int i,j;
queue<int>q;
//vis[x] = true;
cost[x] = 0;
q.push(x);
while(!q.empty()){
int tt = q.front();
//vis[tt] = false;
q.pop();
int dx;
for(i=0;i<3;i++){
for(j=0;j<10;j++){
if(i == 0){
dx = tt*10+j;
}
if(i == 1){
dx = tt + j;
}
if(i == 2){
dx = tt*j;
}
if(dx > y){
continue;
}
if((cost[dx]>cost[tt]+num[i][j]) || (cost[dx]==cost[tt]+num[i][j]&&con[dx]>con[tt]+1)){
cost[dx] = cost[tt] + num[i][j];
con[dx] = con[tt] + 1;
/*if(vis[dx] == false){
q.push(dx);
vis[dx] = true;
}*/
q.push(dx);
}
}
}
}
}
int main(){
int i,j;
while(~scanf("%d%d",&x,&y)){
//memset(vis,false,sizeof(false));
memset(con,0,sizeof(con));
for(i=0;i<MAXN;i++){
cost[i] = INF;
}
for(i=0;i<3;i++){
for(j=0;j<10;j++){
cin>>num[i][j];
}
}
BFS();
printf("Case %d: %d %d\n",cas++,cost[y],con[y]);
}
return 0;
}标签：bfs
原文地址：http://blog.csdn.net/zcr_7/article/details/41451429
