C++：vector比较

当vector里的元素是基本数据类型时，可以直接使用 "=="， "!="， ">="，"<=" 来对两个vector进行比较。

vector<int> a = { 0,1,2,3 };
vector<int> b = { 0,1,2,3 };
bool is_equal = a == b;
if (is_equal) {
  cout << "a==b" << endl;
} else {
  cout << "a!=b" << endl;
}

输出：a==b

vector<int> a = { 0,1,2,3 };
vector<int> b = { 0,1,2 };
bool is_equal = a == b;
if (is_equal) {
  cout << "a==b" << endl;
} else {
  cout << "a!=b" << endl;
}

输出：a!=b

vector<int> a = { 0,1,2,3 };
vector<int> b = { 0,1,2,4 };
bool int_comp = a >= b;
if (int_comp) {
  cout << "a>=b" << endl;
} else {
  cout << "a<b" << endl;
}

输出：a<b

vector<int> a = { 0,1,2,3 };
vector<int> b = { 0,1,2 };
bool int_comp = a >= b;
if (int_comp) {
  cout << "a>=b" << endl;
} else {
  cout << "a<b" << endl;
}

输出：a>=b

vector<int> a = { 0,1,2,3 };
vector<int> b = { 0,1,3 };
bool int_comp = a >= b;
if (int_comp) {
  cout << "a>=b" << endl;
} else {
  cout << "a<b" << endl;
}

输出：a<b