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main.c
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main.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define max(a, b)((a) > (b) ? (a) : (b))
int size_a = -1;
int size_b = -1;
int get_size_of_lcs(char* a, char* b, int i, int j);
void display_matrix(char** matrix, int n, int m);
char** build_path(char* a, char* b);
void print_LCS(char** matrix, char* a, char* b, int i, int j);
int main(int argc, char** argv)
{
if (argc < 3) {
puts("Nombre de parametres insuffisants");
return 1;
}
size_a = strlen(argv[1]);
size_b = strlen(argv[2]);
// int size_lcs = get_size_of_lcs(argv[1], argv[2], 0, 0);
// printf("%d\n", size_lcs);
char** matrix = build_path(argv[1], argv[2]);
display_matrix(matrix, size_a+2, size_b+2);
print_LCS(matrix, argv[1], argv[2], size_a, size_b);
return 0;
}
char** build_path(char* a, char* b) {
char** matrix = malloc(sizeof(char*) * (size_a+2));
int i;
for (i = 0 ; i < size_a+2 ; i++ )
{
matrix[i] = malloc(sizeof(char) * (size_b + 2));
memset(matrix[i], '0', sizeof(char) * (size_b + 2));
}
strcpy(matrix[0]+2, b);
for (i = 2 ; i < size_a +2; i++ )
matrix[i][0] = a[i-2];
int j;
for (i = 2 ; i < size_a + 2 ; i++ )
{
for (j = 2 ; j < size_b + 2; j++ )
{
if (a[i-2] == b[j-2])
matrix[i][j] = 1 + matrix[i-1][j-1];
else
matrix[i][j] = max(matrix[i-1][j], matrix[i][j-1]);
display_matrix(matrix, size_a+2, size_b+2);
}
}
return matrix;
}
void print_LCS(char** matrix, char* a, char* b, int i, int j)
{
if (i == 0 || j == 0)
return;
if (a[i - 1] == b[j - 1])
{
print_LCS(matrix, a, b, i - 1, j - 1);
printf("%c", a[i - 1]);
}
else if (matrix[i][j] == matrix[i - 1][j])
print_LCS(matrix, a, b, i - 1, j);
else
print_LCS(matrix, a, b, i, j - 1);
}
int get_size_of_lcs(char* a, char* b, int i, int j) {
if (i >= size_a || j >= size_b)
return 0;
if (a[i] == b[j])
return 1 + get_size_of_lcs(a, b, i+1, j+1);
else
return max(get_size_of_lcs(a, b, i+1, j), get_size_of_lcs(a, b, i, j+1));
}
FILE* open_file(char* filename) {
FILE* file = fopen(filename, "r");
if (file == NULL) {
printf("Impossible d'ouvrir '%s'\n", filename);
}
return file;
}
void display_matrix(char** matrix, int n, int m) {
int i, j;
for (i = 0 ; i < n ; i++ )
{
for (j = 0 ; j < m; j++ )
printf("%c ", matrix[i][j]);
puts("");
}
puts("");
}