unique words first position entered

x1.words.cpp

// x1.words.cpp
// juanfc 2024-01-08
//
#include <iostream>
#include <array>
using namespace std;

const int MAX_DIFF_WORDS = 1000;
const int MAX_REP = 1000;

typedef array<int,MAX_REP> TPos;

struct TWord {
    string w;
    TPos pos;
    int n;
};

typedef array<TWord,MAX_DIFF_WORDS> TWords;

void add(TWords& ws, string w, int pos);
void printWords(TWords ws);

int main()
{
    TWords ws;
    string w;
    int pos = 0;
    while (cin >> w and w != "end")
        add(ws, w, ++pos);
    printWords(ws);
    return 0;
}

void add(TWords& ws, string w, int pos)
{
    int i = 0;
    while (ws[i].w != "" and ws[i].w != w)
        ++i;
    if (ws[i].w == "") {
        ws[i].w = w;
        ws[i].pos[0] = pos;
        ws[i].n = 1;
    } else {
        ws[i].pos[ ws[i].n++ ] = pos;
    }
}

void printWords(TWords ws)
{
    for (int i = 0; ws[i].w != ""; ++i) {
        cout << ws[i].w << ": ";
        for (int j = 0; j < ws[i].n; ++j) {
            cout << ws[i].pos[j] << ", ";
        }
        cout << endl;
    }
}