Identify bug

[SchattenMonarch]

Bug

Program finds keys that were not inserted. Please comment below, if you understand why.

Console output

Source Code grid_traveler.c

Folder with all necessary files

#define _CRT_SECURE_NO_WARNINGS
#include "grid_traveler.h"
#include "khash.h"
#include <assert.h>
#include <stdio.h>
#include <stdbool.h>
//#define KEY_IN_HASH_MAP (it != kh_end(map_ptr) && kh_str_hash_func(key) == kh_str_hash_func(kh_key(map_ptr, it)))
#define KEY_BUFFER_SIZE 15u

KHASH_MAP_INIT_STR(map, long long)
khash_t(map)* map_ptr; 
khiter_t it;
int ret;
long long val;

void init_grid_traveler(void) {
    map_ptr = kh_init(map);
    it = -1;
    ret = -1;
    val = -1;
}

long long grid_traveler(int row, int column) {
    char key[KEY_BUFFER_SIZE], found_key[KEY_BUFFER_SIZE];
    sprintf(key, "<%d , %d>", row, column);
    printf("ENTERED recursive function with key: %s\n", key);
    if (row == 1 && column == 1) {
        puts("return 1;");
        return 1;
    } 
    if (row == 0 || column == 0) {
        puts("return 0;");
        return 0;
    }

    it = kh_get(map, map_ptr, key);
    int key_hash, found_key_hash;
    if (it != kh_end(map_ptr)) {
        sprintf(found_key, "%s", kh_key(map_ptr, it));
        key_hash = kh_str_hash_func(key);
        found_key_hash = kh_str_hash_func(found_key);
    }

    bool KEY_IN_HASH_MAP = (it != kh_end(map_ptr) && kh_str_hash_func(key) == kh_str_hash_func(kh_key(map_ptr, it)));
    if (KEY_IN_HASH_MAP) {
        printf("Key %s / found key %s found in hash_map with the value %lld\n", key, kh_key(map_ptr, it), kh_val(map_ptr, it));
        return kh_val(map_ptr, it);
    }
    else {
        val = grid_traveler(row - 1, column) + grid_traveler(row, column - 1);
        it = kh_put(map, map_ptr, key, &ret);
        assert(ret != -1);
        kh_val(map_ptr, it) = val;
        printf("Key %s value was CALCULATED: %lld and inserted into the hash_map with the key: %s\n", key, kh_val(map_ptr, it), kh_key(map_ptr, it));
    }
    return kh_val(map_ptr, it);
}

void deinit_grid_traveler(void) {
    free(map_ptr);
}

[attractivechaos]

You need to keep the string contents in the hash table, not the pointers or arrays.

[SchattenMonarch]

@attractivechaos awesome, you saved my day, thank you 😍