USACO comehome Dijkstra
USER: Kevin Samuel [kevin_s1]
TASK: comehome
LANG: C++ Compiling...
Compile: OK Executing...
Test 1: TEST OK [0.003 secs, 3376 KB]
Test 2: TEST OK [0.005 secs, 3376 KB]
Test 3: TEST OK [0.005 secs, 3376 KB]
Test 4: TEST OK [0.005 secs, 3376 KB]
Test 5: TEST OK [0.011 secs, 3376 KB]
Test 6: TEST OK [0.019 secs, 3376 KB]
Test 7: TEST OK [0.035 secs, 3376 KB]
Test 8: TEST OK [0.005 secs, 3376 KB]
Test 9: TEST OK [0.008 secs, 3376 KB] All tests OK. YOUR PROGRAM ('comehome') WORKED FIRST TIME! That's fantastic
-- and a rare thing. Please accept these special automated congratulations. very easy, it's a shortest path problem 建图时直接以A-Z和a-z作为节点建图,我用了一个简单的Dijkstra算法,从Z 点反向找近期的点/*
ID:kevin_s1
PROG:comehome
LANG:C++
*/ #include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
#include <vector>
#include <map>
#include <set>
#include <algorithm>
#include <cstdlib>
#include <list>
#include <cmath> using namespace std; #define MAXN 53
#define INF 99999 //gobal variable==== int P;
int Graph[MAXN][MAXN];
int result;
int Dist[MAXN]; int visited[MAXN];
//================== //function==========
int Convert(char ch){
int index = -1;
if(ch >= 'A' && ch <= 'Z'){
index = ch - 'A' + 1;
}
else if(ch >= 'a' && ch <= 'z'){
index = ch - 'a' + 27;
}
else
index = -1;
return index;
} int Dijkstra(int v0){
int min;
int k;
//init
for(int i = 1; i < MAXN; i++){
visited[i] = false;
Dist[i] = Graph[v0][i];
}
Dist[v0] = 0;
visited[v0] = 1;
for(int v = 1; v < MAXN; v++){
min = INF;
for(int w = 1; w < MAXN; w++){
if(!visited[w] && (Dist[w] < min)){
min = Dist[w];
k = w;
}
}
visited[k] = 1;
for(int w = 1; w < MAXN; w++){
if(!visited[w] && (min + Graph[k][w] < Dist[w])){
Dist[w] = min + Graph[k][w];
}
}
}
int Min = INF;
for(int i = 1; i < MAXN; i++){
if(Dist[i] < Min && i >= 1 && i <= 26 && Dist[i] > 0){
Min = Dist[i];
result = i;
}
}
return Min;
} //================== int main(){
freopen("comehome.in","r",stdin);
freopen("comehome.out","w",stdout);
cin>>P; for(int i = 1; i < MAXN; i++){
Graph[i][i] = INF;
for(int j = 1; j < MAXN; j++){
Graph[i][j] = INF;
}
}
memset(visited, 0, sizeof(visited));
while(P--){
char chst, chen;
int dist;
cin>>chst>>chen>>dist;
int st = Convert(chst);
int en = Convert(chen);
if(dist < Graph[st][en]){
Graph[st][en] = dist;
Graph[en][st] = dist;
}
}
int ans = Dijkstra(26);
char chfarm = 'A' + result - 1;
cout<<chfarm<<" ";
cout<<ans<<endl;
return 0;
}
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