c++ vector操作

1.一维vector变量设置。

# include 
# include 
using namespace std;
int main(){
	vector nums(10, 12);
	for(auto& num: nums){
	cout< 
12 12 12 12 12 12 12 12 12 12
 
2.二维vector变量设置：
 
# include 
# include 
using namespace std;
int main(){
	vector> nums(10, vector(5, 9));
	for(auto& num: nums){
        for(auto& k : num)
            cout< 
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
 
对vector数组进行修改：
 
# include 
# include 
using namespace std;
void change(vector>& nums){
    for(int i = 0; i < nums[0].size(); i++)
        nums[0][i] = 10;
}
int main(){
	vector> nums(10, vector(5, 9));
	change(nums);
	for(auto& num: nums){
        for(auto& k : num)
            cout< 
10 10 10 10 10
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
 
不修改vector数组。
 
# include 
# include 
using namespace std;
void change(vector> nums){
    for(int i = 0; i < nums[0].size(); i++)
        nums[0][i] = 10;
}
int main(){
	vector> nums(10, vector(5, 9));
	change(nums);
	for(auto& num: nums){
        for(auto& k : num)
            cout< 
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9
9 9 9 9 9