duplicate-removal

问题 I want to remove all the repeated characters from a string. For example, if I have: "abcdabef" I want the result to be "cdef" I have tried with loops, but it's getting me confusing. Can anyone just tell me how to do this? Here's what I've tried so far: #include<stdio.h> #include<string.h> main() { char s[20],ch,*p; int i,j,k,cnt; puts("enter string:"); gets(s); for(i=0;s[i];i++) { ch=s[i]; for(cnt=0,j=0;s[j];j++) { if(ch==s[j]) cnt++; if(cnt>1) { for(k=0;s[k]==ch;k++) { strcpy(s+k,s+k+1); if

问题 Using command-line ghostscript, is it possible to remove duplicate embedded objects (images) in the PDF and replace them with a single instance? I have a 200+ pages PDF with a background image and some smaller logos on each page. The file is very large, because the very same background image and logo binaries are embedded in each individual page, instead of being embedded once and then referenced on each page. I am not the creator of the PDF so I can not solve the problem at it's source. (I

问题 Using command-line ghostscript, is it possible to remove duplicate embedded objects (images) in the PDF and replace them with a single instance? I have a 200+ pages PDF with a background image and some smaller logos on each page. The file is very large, because the very same background image and logo binaries are embedded in each individual page, instead of being embedded once and then referenced on each page. I am not the creator of the PDF so I can not solve the problem at it's source. (I

问题 I have a KeyValuePair List in C# formatted as string,int with an example content: mylist[0]=="str1",5 mylist[2]=="str1",8 I want some code to delete one of the items and to the other add the duplicating values. So it would be: mylist[0]=="str1",13 Definition Code: List<KeyValuePair<string, int>> mylist = new List<KeyValuePair<string, int>>(); Thomas, I'll try to explain it in pseudo code. Basically, I want mylist[x]==samestring,someint mylist[n]==samestring,otherint Becoming: mylist[m]=

问题 I am collating multiple excel files into one using data frames. There are duplicate columns in the files. Is it possible to merge only the unique columns? Here is my code: library(rJava) library (XLConnect) data.files = list.files(pattern = "*.xls") # Read the first file df = readWorksheetFromFile(file=data.files[1], sheet=1, check.names=F) # Loop through the remaining files and merge them to the existing data frame for (file in data.files[-1]) { newFile = readWorksheetFromFile(file=file,

问题 I read all the relevant duplicated questions/answers and I found this to be the most relevant answer: INSERT IGNORE INTO temp(MAILING_ID,REPORT_ID) SELECT DISTINCT MAILING_ID,REPORT_IDFROM table_1 ; The problem is that I want to remove duplicates by col1 and col2, but also want to include to the insert all the other fields of table_1. I tried to add all the relevant columns this way: INSERT IGNORE INTO temp(M_ID,MAILING_ID,REPORT_ID, MAILING_NAME,VISIBILITY,EXPORTED) SELECT DISTINCT M_ID

问题 I want to read a file, eliminate all duplicates and write the rest back into the file - like a duplicate cleaner. Vec because a normal array has a fixed size but my .txt is flexible (am I doing this right?). Read, lines in Vec + delete duplices: Missing write back to file. use std::io; fn main() { let path = Path::new("test.txt"); let mut file = io::BufferedReader::new(io::File::open(&path, R)); let mut lines: Vec<String> = file.lines().map(|x| x.unwrap()).collect(); // dedup() deletes all

问题 I have a table with year column and this column shouldn't have duplicate values. So I end up with a table with only one 2007 year record for example. So how could I delete those rows that have duplicate year value? Thanks 回答1: I think you could simply try adding a UNIQUE INDEX using IGNORE: ALTER IGNORE TABLE `table` ADD UNIQUE INDEX `name` (`column`); MySQL should respond with something like: Query OK, 4524 rows affected (1.09 sec) Records: 4524 Duplicates: 9342 Warnings: 0 Of course, you'll

问题 I have a table with year column and this column shouldn't have duplicate values. So I end up with a table with only one 2007 year record for example. So how could I delete those rows that have duplicate year value? Thanks 回答1: I think you could simply try adding a UNIQUE INDEX using IGNORE: ALTER IGNORE TABLE `table` ADD UNIQUE INDEX `name` (`column`); MySQL should respond with something like: Query OK, 4524 rows affected (1.09 sec) Records: 4524 Duplicates: 9342 Warnings: 0 Of course, you'll

问题 Yes, you can find similar questions numerous times, but: the most elegant solutions posted here, work for SQL Server, but not for Sybase (in my case Sybase Anywhere 11). I have even found some Sybase-related questions marked as duplicates for SQL Server questions, which doesn't help. One example for solutions I liked, but didn't work, is the WITH ... DELETE ... construct. I have found working solutions using cursors or while-loops, but I hope it is possible without loops. I hope for a nice,