vector<int> a; a.push_back(1); a.push_back(2); a.push_back(3); vector<int> b; b.push_back(4); b.push_back(5); b.push_back(6); vec.push_back(a); vec.push_back(b); 遍历 voidreverse_with_iterator(vector<vector<int>> vec){if(vec.empty()) { cout <<"The vector is ...
typedef struct vector { int *data; size_t size; size_t back; } vector; void push_back(vector *v, int e) // 向量尾部添加元素 { if (v->back < v->size) { v->data[v->back] = e; v->back++; } else if (v->back == v->size) // 如果向量已满,则重新分配2倍空间,并在...
push_back的作用有两个:告诉编译器为新元素开辟空间、将新元素存入新空间里。 比如下面的代码是错误的,但是编译器不会报错,就像是数组越界。 vector<int>vec; vec[0] =1;//错误! 当然我们也可以选择使用迭代器来访问元素 vector<string> v6 = {"hi","my","name","is","lee"};for(vector<string>::ite...
【CC++】vector动态二维数组 【CC++】vector动态⼆维数组 1. 声明 vector<vector<int> vec;//赋值思路可以从这个很基础的操作⾥看出来 vector<int> a;a.push_back(1);a.push_back(2);a.push_back(3);vector<int> b;b.push_back(4);b.push_back(5);b.push_back(6);vec.push_back(a);vec....
新开空间存入你push_back的字符串。vector不会去检测内容是否相同
-1.vector 的数据的存入和输出:#include<stdio.h>#include<vector>#include <iostream>using namespace std;void main() int i = 0; vector<int> v; for( i = 0; i < 10; i+ ) v.push_back( i );/把元素一个一个存入到vector中 对存入的数据清空 f 8、or( i = 0; i < v.size(); ...
push_back errors in the vector of c Closed - Not a Bug16 0Votes 1313162145160 -Reported Dec 29, 2019 3:35 PM 在内层循环里j的值应该递增(1~9),但是被添加到vector sc里的全部为1(直接打印j是正常的) Visual Studiowindows 10.0visual studio 2019 version 16.4 ...
#include <vector> #include <iostream> #include <iomanip> int main() { std::vector<std::string> numbers; numbers.push_back("abc"); std::string s = "def"; numbers.push_back(std::move(s)); std::cout << "vector holds: "; for (auto&& i : numbers) std::cout << std::quoted(...
#define pb push_back #define pi pair<int, int> #define mk make_pair using namespace std; typedef long long ll; ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;} const int N=1e3+10; int a[N]; int main() { int n;
vector就是一种数组，例如定义 vector<int> a;只要用push_back往a里添加了元素，就可以用a[0]这样的格式来读取里面的元素。