diff --git a/vector.c b/vector.c
index bfbea79..d4cb438 100644
--- a/vector.c
+++ b/vector.c
@@ -25,7 +25,10 @@ void
 vector_initdata(ivector *v, int *arr, size_t arrsz)
 {
 	assert(v && arrsz);
-	// <YOURCODE>
+	v->n = arrsz;
+	v->maxsz = (arrsz > VECTOR_START_SIZE) ? arrsz : VECTOR_START_SIZE;
+	v->data = xmalloc(ITEMSZ * v->maxsz);
+	memcpy(v->data, arr, arrsz * ITEMSZ);
 }
 
 void
@@ -43,67 +46,94 @@ size_t
 vector_len(const ivector *v)
 {
 	assert(v);
-
-	// <YOURCODE>
-	return 0;
+	return v->n;
 }
 
 int *
 vector_data(const ivector *v)
 {
 	assert(v);
-	// <YOURCODE>
-	return NULL;
+	return v->data;
 }
 
 void
 vector_resize(ivector *v, int n)
 {
 	assert(v);
-
-	// <YOURCODE>
+	if (n <= v->maxsz) {
+		if (n > v->n) {
+			memset(v->data + v->n, 0, (n - v->n) * ITEMSZ);
+		}
+		v->n = n;
+	} else {
+		size_t new_max = v->maxsz;
+		while (new_max < n) {
+			new_max *= VECTOR_GROW_FACTOR;
+		}
+		v->data = xrealloc(v->data, new_max * ITEMSZ);
+		if (n > v->n) {
+			memset(v->data + v->n, 0, (n - v->n) * ITEMSZ);
+		}
+		v->n = n;
+		v->maxsz = new_max;
+	}
 }
 
 void
 vector_set(ivector *v, size_t idx, int val)
 {
 	assert(v && idx < v->n);
-	// <YOURCODE>
+	v->data[idx] = val;
 }
 
 int
 vector_get(const ivector *v, size_t idx)
 {
 	assert(v && idx < v->n);
-	// <YOURCODE>
-	return 0;
+	return v->data[idx];
 }
 
 void
 vector_push(ivector *v, int val)
 {
 	assert(v);
-	// <YOURCODE>
+	if (v->n == v->maxsz) {
+		vector_resize(v, v->n + 1);
+		v->data[v->n - 1] = val;
+	} else {
+		v->data[v->n++] = val;
+	}
 }
 
 void
 vector_pop(ivector *v)
 {
 	assert(v);
-	// <YOURCODE>
+	if (v->n > 0){
+		v->n--;
+	}
 }
 
 void
 vector_insert(ivector *v, size_t idx, int val)
 {
 	assert(v && v->n >= idx);
-	// <YOURCODE>
+	if (v->n == v->maxsz) {
+		size_t new_max = v->maxsz * VECTOR_GROW_FACTOR;
+		v->data = xrealloc(v->data, new_max * ITEMSZ);
+		v->maxsz = new_max;
+	}
+	memmove(v->data + idx + 1, v->data + idx, (v->n - idx) * ITEMSZ);
+	v->data[idx] = val;
+	v->n++;
 }
 
 void
 vector_del(ivector *v, size_t idx)
 {
-	// <YOURCODE>
+	assert(v && idx < v->n);
+	memmove(v->data + idx, v->data + idx + 1, (v->n - idx - 1) * ITEMSZ);
+	v->n--;
 }
 
 void
@@ -111,3 +141,4 @@ vector_clear(ivector *v)
 {
 	vector_resize(v, 0);
 }
+