fun errror

B.cdpwd.cpp

#include <stdio.h>
#include <iostream>
#include <string.h>
#include <algorithm>

#define N 10000
using namespace std;

int filter(char* str, char* out, int out_pos){
    int len = strlen(str);
    int curr = 0;
    int should_be = 0;
    while (curr < len){
        if(curr+1 < len && str[curr] == '.' && str[curr+1] == '.') {
            //go to prev dir
            should_be = curr;
            out_pos-=2;
            while (out[out_pos] != '/'){
                out_pos--;
            }

            if(curr+2 < len && str[curr+2] != NULL)
                curr += 2;
            else
                curr += 3;
        }
        else
            out[out_pos++] = str[curr++];
    }
    out[out_pos] = 0;
    return out_pos;
}

int main() {

    int n;
    cin >> n;

    char command [N];
    char curr_str [N];
    int curr_pos = 0;

    while (n >= 0) {
        n--;

        cin.getline(command, N);

        if (string(command, 2) == "cd"){
            if (command[3] == '/'){
                curr_pos = 0;
            }
            else if (curr_str[curr_pos] != '/')
                curr_str[curr_pos++] = '/';
            //(command[3] != '.') {
            if (command[3] == '.'){
                curr_pos--;
                curr_pos = filter(command+2, curr_str, curr_pos);
            }
            else
                curr_pos = filter(command+3, curr_str, curr_pos);
            //printf("\n curr_str: %s\n", curr_str);
            //}

        }
        else if (string(command, 3) == "pwd"){
            if (curr_pos <= 0)
                printf("/\n");
            else
                printf("%s/\n", curr_str);
        }
    }

    return 0;
}