小程式:從列表中移除

來源資料, 只看第一個
1 2 3
2 2 3
3 2 3
4 2 3

要刪除的內容
1
3

結果會得到
2
4

使用方法
process test.txt rmlist.txt result.txt

debug原始載入資料
process test.txt rmlist.txt result.txt 1

debug載入資料第一欄
process test.txt rmlist.txt result.txt 2

#include <vector>
#include <iostream>
#include <string>
#include <fstream>
#include <algorithm>
#include <sstream>

using namespace std;

int DEBUG = 0;

string outpath = "result.txt";

int main(int argc, char** argv) {
    cout << argc << endl;
    if (argc <= 2) return -1;
    cout << "long list:" << argv[1] << endl;
    cout << "remove list:" << argv[2] << endl;
    if (argc > 3) outpath = argv[3];
    cout << "output file:" << outpath << endl;
    if (argc > 4) DEBUG = atoi(argv[4]);
    ifstream rdf(argv[1], ifstream::in);
    ifstream rmf(argv[2], ifstream::in);
    ofstream outf(outpath.c_str(), ios_base::out|ios_base::trunc);
    string line;
    vector<string> list;
    while(getline(rdf, line)) {
        if (DEBUG == 1) cout << line << endl;
        // only read the first column
        istringstream iss(line);
        string col1;
        iss >> col1;
        list.push_back(col1);
        if (DEBUG == 2) cout << col1 << endl;
    }
    cout << "list loaded " << list.size() << endl;
    vector<string> rmlist;
    while(getline(rmf, line)) {
        rmlist.push_back(line);
        if (DEBUG) cout << line << endl;
    }
    cout << "rmlist loaded " << rmlist.size() << endl;
    for (int i=0; i <rmlist.size() ; ++i) {
        vector<string>::iterator itr;
        int cnt = 0;
        do {
            itr = find(list.begin(), list.end(), rmlist[i]);
            if (itr != list.end()) {
                list.erase(itr);
                cnt ++;
            } else {
                break;
            }
        } while(true);
        if (cnt == 0) {
            cout << " item: " << rmlist[i] << " not found in the list" << endl;
        } else {
            if (DEBUG) cout << " item: " << rmlist[i] << " removed " << cnt << endl;
        }
    }
    cout << "list output " << list.size() << endl;
    for (int i=0 ; i<list.size() ; ++i) {
        outf << list[i] << endl;
    }
    outf.flush();
    outf.close();
    return 0;
}