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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#define VECTOR_DEF(T) \
typedef struct { \
T* buffer; \
int size; \
int cap; \
} T##Vector; \
\
void T##Vector_init(T##Vector *self); \
void T##Vector_push_back(T##Vector *self, T elem); \
void T##Vector_insert_before(T##Vector *self, int n, T elem); \
void T##Vector_pop(T##Vector *self); \
bool T##Vector_empty(T##Vector *self); \
void T##Vector_remove(T##Vector *self, size_t n); \
size_t T##Vector_len(T##Vector *self); \
T* T##Vector_begin(T##Vector *self); \
T* T##Vector_last(T##Vector *self); \
T* T##Vector_end(T##Vector *self); \
T* T##Vector_ref(T##Vector *self, size_t n); \
void T##Vector_swap(T##Vector *self, int i, int j); \
T##Vector T##Vector_move(T##Vector *self); \
void T##Vector_show(T##Vector *self, FILE* fp); \
void T##Vector_free(T##Vector *self);
#define VECTOR_IMPL(T) \
void T##Vector_init(T##Vector *self) { \
self->buffer = (T*)malloc(sizeof(T) * 16); \
self->cap = 16; \
self->size = 0; \
} \
\
void T##Vector_push_back(T##Vector *self, T elem) { \
if (self->size + 1 > self->cap) { \
self->buffer = realloc(self->buffer, sizeof(T) * self->cap * 2); \
self->cap *= 2; \
} \
self->buffer[self->size] = elem; \
self->size += 1; \
} \
void T##Vector_insert_before(T##Vector *self, int n, T elem) { \
if (n < 0 || n > self->size) { \
return; \
} \
if (self->size + 1 > self->cap) { \
self->buffer = malloc(sizeof(T) * self->cap * 2); \
self->cap *= 2; \
} \
if (n != self->size) { \
memmove(self->buffer + n + 1, \
self->buffer + n, \
sizeof(T) * (self->size - n)); \
self->buffer[n] = elem; \
self->size += 1; \
} \
} \
void T##Vector_pop(T##Vector *self) { \
self->size -= 1; \
} \
void T##Vector_remove(T##Vector *self, size_t n) { \
if (n < 0 || n >= self->size) return; \
memmove(self->buffer + n, \
self->buffer + n + 1, \
sizeof(T) * self->size - n - 1); \
self->size -= 1; \
} \
T* T##Vector_begin(T##Vector *self) { return self->buffer; } \
bool T##Vector_empty(T##Vector *self) { return self->size == 0; } \
T* T##Vector_end(T##Vector *self) { return self->buffer + self->size; } \
T* T##Vector_last(T##Vector *self) { return self->buffer + self->size - 1; } \
T* T##Vector_ref(T##Vector *self, size_t n) { return self->buffer + n; } \
void T##Vector_swap(T##Vector *self, int i, int j) { \
T buf; \
memcpy(&buf, self->buffer + i, sizeof(T)); \
memcpy(self->buffer + i, self->buffer + j, sizeof(T)); \
memcpy(self->buffer + j, &buf, sizeof(T)); \
} \
T##Vector T##Vector_move(T##Vector *self) { \
T##Vector dup = *self; \
self->buffer = NULL; \
self->size = 0; \
self->cap = 0; \
return dup; \
} \
void T##Vector_show(T##Vector *self, FILE* fp) { \
fprintf(fp, "["); \
for (int i = 0; i < self->size-1; i++) { \
T##_show(&self->buffer[i], fp); \
fprintf(fp, ", "); \
} \
if (self->size > 0) { \
T##_show(&self->buffer[self->size - 1], fp); \
} \
fprintf(fp, "]"); \
} \
size_t T##Vector_len(T##Vector *self) { return self->size; } \
void T##Vector_free(T##Vector *self) { free(self->buffer); }
typedef char *String;
void String_show(String *s, FILE *fp) {
fprintf(fp, "%s", *s);
}
VECTOR_DEF(String);
VECTOR_IMPL(String);
char *append(char *s, char c) {
int len = strlen(s);
char *ns = malloc(len + 2);
strcpy(ns, s);
ns[len] = c;
ns[len + 1] = '\0';
return ns;
}
void gen_impl(StringVector *res, char* current, int n, int unclosed, int finished) {
if (unclosed == 0 && finished == n) {
printf("add: %s\n", current);
StringVector_push_back(res, current);
StringVector_show(res, stdout);
return;
}
if (unclosed > 0) {
gen_impl(res, append(current, ')'), n, unclosed - 1, finished + 1);
}
if (unclosed + finished < n) {
gen_impl(res, append(current, '('), n, unclosed + 1, finished);
}
free(current);
}
char** generateParenthesis(int n, int* returnSize) {
StringVector result;
StringVector_init(&result);
char *empty = malloc(1);
empty[0] = '\0';
gen_impl(&result, empty, n, 0, 0);
*returnSize = StringVector_len(&result);
return result.buffer;
}
int main() {
int size;
generateParenthesis(3, &size);
printf("\n");
}
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