Bash 解法, 执行用时: 2ms, 内存消耗: 416KB, 提交时间: 2021-09-24

declare -A arr
while read line
do
    temparr=($line)
    arr[${temparr[1]}]=$((${arr[${temparr[1]}]}+1))
done
for key in ${!arr[@]}
do
    if [[ ${arr[$key]} -gt 1 ]]
    then
        echo ${arr[$key]}" "$key
    fi
done

Bash 解法, 执行用时: 3ms, 内存消耗: 376KB, 提交时间: 2021-06-16

#!/bin/bash
# awk '{a[$2]++}END{for(i in a){if (a[i]>1) {print a[i],i}}}' nowcoder.txt
unset map
declare -A map
 
while read line
do
  j=(${line[@]})
  i=${j[1]}
  if [[ -z ${map[$i]} ]];then
    map[$i]=1
  else
    ((map[$i]++))
  fi
done < nowcoder.txt
 
mm=()
for i in ${!map[@]}
do
  if [ ${map[$i]} -gt 1 ];then
#     echo ${map[$i]} $i
    mm[${#mm[@]}]=${map[$i]}
  fi
done
 
for (( i=0;i<${#mm[@]};i++ ))
do
  for (( j=$[$i+1];j<${#mm[@]};j++ ))
  do
    if [ ${mm[i]} -gt ${mm[j]} ];then
      tmp=${mm[i]}
      mm[i]=${mm[j]}
      mm[j]=$tmp
    fi
  done
done
 
for (( i=0;i<${#mm[@]};i++ ))
do
  for j in ${!map[@]}
  do
    if [ ${map[$j]} -eq ${mm[$i]} ];then
      echo ${map[$j]} $j
    fi
  done
done

Bash 解法, 执行用时: 3ms, 内存消耗: 376KB, 提交时间: 2021-04-18

# awk '{a[$2]++}END{for(i in a){if (a[i]>1) {print a[i],i}}}' nowcoder.txt

unset map
declare -A map

while read line
do
  j=(${line[@]})
  i=${j[1]}
  if [[ -z ${map[$i]} ]];then
    map[$i]=1
  else
    ((map[$i]++))
  fi
done < nowcoder.txt

mm=()
for i in ${!map[@]}
do
  if [ ${map[$i]} -gt 1 ];then
#     echo ${map[$i]} $i
    mm[${#mm[@]}]=${map[$i]}
  fi
done

for (( i=0;i<${#mm[@]};i++ ))
do
  for (( j=$[$i+1];j<${#mm[@]};j++ ))
  do
    if [ ${mm[i]} -gt ${mm[j]} ];then
      tmp=${mm[i]}
      mm[i]=${mm[j]}
      mm[j]=$tmp
    fi
  done
done

for (( i=0;i<${#mm[@]};i++ ))
do
  for j in ${!map[@]}
  do
    if [ ${map[$j]} -eq ${mm[$i]} ];then
      echo ${map[$j]} $j
    fi
  done
done

Bash 解法, 执行用时: 3ms, 内存消耗: 384KB, 提交时间: 2021-05-12

declare -A map

while read line
do
    j=(${line[@]})
    i=${j[1]}
    if [[ -z ${map[$i]} ]];then
        map[$i]=1
    else
        ((map[$i]++))
    fi
done < nowcoder.txt

mm=()
for i in ${!map[@]}
do
    if [ ${map[$i]} -gt 1 ];then
        mm[${#mm[@]}]=${map[$i]}
    fi
done

for ((i=0;i<${#mm[@]};i++))
do
    for ((j=$[$i+1];j<${#mm[@]};j++))
    do
        if [ ${mm[i]} -gt ${mm[j]} ];then
            temp=${mm[i]}
            mm[i]=${mm[j]}
            mm[j]=$temp
        fi
    done 
done

for ((i=0;i<${#mm[@]};i++))
do
    for j in ${!map[@]}
    do
        if [ ${map[$j]} -eq ${mm[$i]} ];then
            echo ${map[$j]} $j
        fi
    done
done

Bash 解法, 执行用时: 3ms, 内存消耗: 408KB, 提交时间: 2021-12-27

declare -A map
while read line 
do
arr=(${line})
i=${arr[1]}
if [ -z ${map[$i]} ] 
    then
    map[$i]=1
    else ((map[$i]++))
fi
done < nowcoder.txt

for i in ${!map[@]}
do
    if [ ${map[$i]} -gt 1 ]
    then
        echo ${map[$i]} $i
    fi
done