C++primer 11.1-day exercise

Exercise 11.1

Map He is an orderly and element-repeating associative container, and the way in which he stores elements is stored in the form of key-value pairs;

There are no special requirements for vector containers.

Exercise 11.2

List is useful for adding deleted elements anywhere, because he is a doubly linked list;

Vectors are suitable for programs that require random access, can only add elements after the tail, and adding or removing elements at other locations is inefficient;

The deque is suitable for adding deleted elements at the end of the container and randomly accessing the program;

Map is a set of key-value pairs, he can be found in the simultaneous efficient access;

Set is a simple set of keywords that is most useful when you just want to know if a value exists.

Exercise 11.3

1#include <iostream>2#include <string>3#include <iostream>4#include <string>5#include <vector>6#include <algorithm>7#include <list>8#include <functional>9#include <iterator>Ten#include <fstream> One#include <map> A#include <Set> - using namespacestd; - using namespaceplaceholders; the  - intMain () - { -Ifstreaminch("Title.txt"); +     stringstr; -map<string, size_t>Word_count; +     Set<string> exclude{"a"," an" }; A      while(inch>>str) at     { -         if(Exclude.find (str) = =exclude.end ()) -++Word_count[str]; -     } -      for(ConstAuto &w:word_count) -     { incout << W.first <<"occurs"<< W.second << ((W.second >1) ?" Times":" Time") <<Endl; -     } toSystem"Pause"); +     return 0; -}

Exercise 11.4

1#include <iostream>2#include <cctype>3#include <string>4#include <iostream>5#include <string>6#include <vector>7#include <algorithm>8#include <list>9#include <functional>Ten#include <iterator> One#include <fstream> A#include <map> -#include <Set> - using namespacestd; the using namespaceplaceholders; -  - string&change (string&s); - voidDelete_punct (string&s); +  - intMain () + { A     //Ifstream in ("Title.txt"); at     stringstr; -map<string, size_t>Word_count; -     Set<string> exclude{"a"," an" }; -      while(Cin >> str)//there is an error reading the file here, the reason is unknown -     { -         if(Exclude.find (str) = =exclude.end ()) in++Word_count[change (str)]; -     } to      for(ConstAuto &w:word_count) +     { -cout << W.first <<"occurs"<< W.second << ((W.second >1) ?" Times":" Time") <<Endl; the     } *System"Pause"); $     return 0;Panax Notoginseng } -  the string&change (string&s) + { A      for(Auto i =0; I! = S.size (); ++i) the     { +         if(Isupper (S[i])) -S[i] =ToLower (S[i]); $         if(Ispunct (S[i]))//the input punctuation here will be error, temporarily consider the flow input mode of CIN, to be resolved $S.erase (I,1); -     } -     returns; the}

C++primer 11.1-day exercise