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@phonism
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
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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