Created
October 7, 2013 06:16
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LightOJ 1027 - A Dangerous Maze http://lightoj.com/volume_showproblem.php?problem=1027
概率
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import java.io.BufferedReader; | |
import java.io.IOError; | |
import java.io.IOException; | |
import java.io.InputStream; | |
import java.io.InputStreamReader; | |
import java.io.OutputStreamWriter; | |
import java.io.PrintWriter; | |
import java.util.StringTokenizer; | |
public class P1027 { | |
int gcd(int a, int b) { | |
return b > 0 ? gcd(b, a % b) : a; | |
} | |
public void run() { | |
Scanner cin = new Scanner(System.in); | |
PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out)); | |
int test = cin.nextInt(); | |
for (int cas = 1; cas <= test; cas++) { | |
int n = cin.nextInt(); | |
int num = 0, sum = 0; | |
for (int i = 0; i < n; i++) { | |
int x = cin.nextInt(); | |
if (x < 0) { | |
sum += -x; | |
} else { | |
sum += x; | |
num++; | |
} | |
} | |
if (num == 0) { | |
System.out.println("Case " + cas + ": inf"); | |
} else { | |
int ansx = sum / gcd(sum, num); | |
int ansy = num / gcd(sum, num); | |
System.out.println("Case " + cas + ": " + ansx + "/" + ansy); | |
} | |
} | |
cout.flush(); | |
} | |
public static void main(String args[]) { | |
new P1027().run(); | |
} | |
class Scanner { | |
BufferedReader br; | |
StringTokenizer st; | |
Scanner(InputStream in) { | |
br = new BufferedReader(new InputStreamReader(in)); | |
eat(""); | |
} | |
void eat(String s) { | |
st = new StringTokenizer(s); | |
} | |
String nextLine() { | |
try { | |
return br.readLine(); | |
} catch (IOException e) { | |
throw new IOError(e); | |
} | |
} | |
boolean hasNext() { | |
while (!st.hasMoreTokens()) { | |
String s = nextLine(); | |
if (s == null) | |
return false; | |
eat(s); | |
} | |
return true; | |
} | |
String next() { | |
hasNext(); | |
return st.nextToken(); | |
} | |
int nextInt() { | |
return Integer.parseInt(next()); | |
} | |
long nextLong() { | |
return Long.parseLong(next()); | |
} | |
double nextDouble() { | |
return Double.parseDouble(next()); | |
} | |
} | |
} |
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