// an iterator that cannot write elements vector<int>::const_iterator // an iterator whose value cannot change const vector<int>::iterator
s.empty()
Returns true if s is empty; otherwise returns false
s.size()
Returns number of characters in s
s[n]
Returns the character at position n in s; positions start at 0.
s1 + s2
Returns a string equal to the concatenation of s1 and s2
s1 = s2
Replaces characters in s1 by a copy of s2
v1 == v2
Returns true if v1 and v2 are equal; false otherwise
!=, <, <=, >, and >=
Have their normal meanings
v.empty()
Returns true if v is empty; otherwise returns false
v.size()
Returns number of elements in v
v.push_back(t)
Adds element with value t to end of v
v[n]
Returns element at position n in v
v1 = v2
Replaces elements in v1 by a copy of elements in v2
v1 == v2
Returns TRue if v1 and v2 are equal
!=, <, <=, >, and >=
Have their normal meanings
//The iterator returned by begin refers to the first element, if any, in the container: vector<int>::iterator iter = ivec.begin();//The iterator returned by the end operation is an iterator positioned "one past the end" of the vector. vector<int>::iterator iter = ivec.end();
If the vector is empty, the iterator returned by begin is the same as the iterator returned by end.
