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$ cat LowGrades.java import java.io.InputStream; import java.io.PrintStream; import java.util.Collections; import java.util.HashMap; import java.util.Map; import java.util.Scanner; import java.util.Vector; class LowGrades { private static Map<String, Integer> in(InputStream ins) { final Scanner scanner = new Scanner(ins); scanner.useDelimiter("[|\n]"); final HashMap<String, Integer> lowGrades = new HashMap<String, Integer>(); while (scanner.hasNextInt()) { scanner.nextInt(); final String course = scanner.next(); int grade = scanner.nextInt(); if (lowGrades.containsKey(course)) grade = Math.min(lowGrades.get(course), grade); lowGrades.put(course, grade); } return lowGrades; } public static void main(String[] args) { out(System.out, in(System.in)); } private static void out(PrintStream outs, Map<String, Integer> lowGrades) { final Vector<String> keys = new Vector<String>(lowGrades.keySet()); Collections.sort(keys); for (String key : keys) outs.printf("%s %d%n", key, lowGrades.get(key)); } } $ javac -Xlint LowGrades.java $ cat LowGradesData #! /usr/bin/awk -f {for (i = 1; i <= NF; ++i) { l = length($i) lines[lcnt++] = "1|" $i "|" l n = int(rand()*10) + 1 while (n-- > 0) { l += int(rand()*10) lines[lcnt++] = "1|" $i "|" l } } } END { while (lcnt > 0) { l = int(rand()*lcnt) print lines[l] lines[l] = lines[--lcnt] } } $ echo facts all come with points of view | ./LowGradesData 1|of|30 1|all|3 1|all|18 1|points|6 1|of|9 1|facts|16 1|with|13 1|all|13 1|all|21 1|view|36 1|come|31 1|facts|7 1|view|4 1|facts|15 1|of|46 1|all|4 1|come|13 1|view|25 1|come|25 1|with|8 1|view|22 1|view|35 1|all|12 1|view|15 1|with|18 1|of|23 1|view|43 1|with|7 1|of|37 1|view|57 1|facts|5 1|view|26 1|points|12 1|view|7 1|with|26 1|come|23 1|view|48 1|of|7 1|points|12 1|come|15 1|all|17 1|of|3 1|with|4 1|with|26 1|of|15 1|come|4 1|of|2 $ echo facts all come with points of view | ./LowGradesData | java LowGrades all 3 come 4 facts 5 of 2 points 6 view 4 with 4 $
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