#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void merge(char** arr, int left, int mid, int right) {
int i, j, k;
int n1 = mid - left + 1;
int n2 = right - mid;

char** L = (char**)malloc(n1 * sizeof(char*));
char** R = (char**)malloc(n2 * sizeof(char*));

for (i = 0; i < n1; i++)
    L[i] = arr[left + i];
for (j = 0; j < n2; j++)
    R[j] = arr[mid + 1 + j];

i = 0;
j = 0;
k = left;

while (i < n1 && j < n2) {
    if (strlen(L[i]) <= strlen(R[j])) {
        arr[k] = L[i];
        i++;
    } else {
        arr[k] = R[j];
        j++;
    }
    k++;
}

while (i < n1) {
    arr[k] = L[i];
    i++;
    k++;
}

while (j < n2) {
    arr[k] = R[j];
    j++;
    k++;
}

free(L);
free(R);

}

void mergeSort(char** arr, int n) {
int currSize, leftStart;

for (currSize = 1; currSize <= n - 1; currSize = 2 * currSize) {
    for (leftStart = 0; leftStart < n - 1; leftStart += 2 * currSize) {
        int mid = leftStart + currSize - 1;
        int rightEnd = (leftStart + 2 * currSize - 1) < (n - 1) ? (leftStart + 2 * currSize - 1) : (n - 1);

        merge(arr, leftStart, mid, rightEnd);
    }
}

}

int main() {
char inputFileName[100];
char outputFileName[100];

printf("輸入文件名：");
scanf("%s", inputFileName);

printf("輸出文件名：");
scanf("%s", outputFileName);

FILE* inputFile = fopen(inputFileName, "r");
FILE* outputFile = fopen(outputFileName, "w");

if (inputFile == NULL) {
    printf("無法打開入文件。\n");
    return 1;
}

if (outputFile == NULL) {
    printf("無法輸出文件。\n");
    return 1;
}

char** strings = NULL;
char buffer[100];
int count = 0;
while (fgets(buffer, sizeof(buffer), inputFile) != NULL) {
    buffer[strcspn(buffer, "\n")] = '\0';
    strings = (char**)realloc(strings, (count + 1) * sizeof(char*));
    strings[count] = (char*)malloc((strlen(buffer) + 1) * sizeof(char));
    strcpy(strings[count], buffer);
    count++;
}

mergeSort(strings, count);

for (int i = 0; i < count; i++) {
    fprintf(outputFile, "%s\n", strings[i]);
}

for (int i = 0; i < count; i++) {
    free(strings[i]);
}
free(strings);

fclose(inputFile);
fclose(outputFile);

printf("排序完成。\n");

return 0;

}
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