Java-POJ1013-Counterfeit Dollar
在13枚硬币中找出fake的那一个
输入:三次天平称量结果
package poj.ProblemSet; import java.util.Scanner; /*
我怎么觉得是贪心算法呢?
起初对所有硬币标记0;
如果是even,则两边所有的硬币记为真(记233);
否则就对不确定的硬币记录怀疑(++或者--根据天平倾斜方向);
最后只要看哪个硬币的绝对值最大,也就是被怀疑的次数最多,即是假币。
*/
public class poj1013 {
public static int[] value = new int[20];
public static String[] a = new String[5];
public static String[] b = new String[5];
public static String[] c = new String[5];
public static final int REAL = 233; public static void work(int r, int len, int type) {
if (type == 1) {
for (int i = 0; i < len; i++) {
if (value[a[r].charAt(i)-'A'+1] != REAL) value[a[r].charAt(i)-'A'+1]++;
if (value[b[r].charAt(i)-'A'+1] != REAL) value[b[r].charAt(i)-'A'+1]--;
}
}
else if (type == 2) {
for (int i = 0; i < len; i++) {
if (value[a[r].charAt(i)-'A'+1] != REAL) value[a[r].charAt(i)-'A'+1]--;
if (value[b[r].charAt(i)-'A'+1] != REAL) value[b[r].charAt(i)-'A'+1]++;
}
}
else /*if (type == 3)*/ {
for (int i = 0; i < len; i++) {
value[a[r].charAt(i)-'A'+1] = REAL;
value[b[r].charAt(i)-'A'+1] = REAL;
}
} } public static void main(String[] args) {
Scanner cin = new Scanner(System.in);
for (int n = cin.nextInt(); n-- > 0; ) {
for (int i = 1; i < 20; i++) value[i] = 0;
for (int r = 1; r <= 3; r++) {
a[r] = cin.next();b[r] = cin.next();c[r] = cin.next();int len = a[r].length();
if (c[r].equals("up")) work(r, len, 1);
else if (c[r].equals("down")) work(r, len, 2);
else /*if (c[r].equals("even"))*/ work(r, len, 3);
}
int max = 0,id = 0;
for (int i = 1; i <= 13; i++) {
int val = Math.abs(value[i]);
if (value[i] != REAL && val > max) { max = val;id = i; }
}
System.out.println((char)(id-1+'A') + " is the counterfeit coin and it is " + (value[id]>0?"heavy":"light") + ".");
}
}
}
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