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#include <iostream>
#include <string>
#include <map>
using namespace std;
int main() {
map<string, size_t> word_count;
string word;
while (cin >> word) {
++word_count[word];
}
for (const auto &w : word_count) {
cout << w.first << " occurs " << w.second << ((w.second > 1) ? " times" : " time") << endl;
}
return 0;
}
答:
#include <iostream>
#include <string>
#include <map>
#include <cctype>
using namespace std;
string processWord(const string& word) {
string result;
for (char ch : word) {
if (!ispunct(ch)) {
result += tolower(ch);
}
}
return result;
}
int main() {
map<string, size_t> word_count;
string word;
while (cin >> word) {
string processed_word = processWord(word);
++word_count[processed_word];
}
for (const auto &w : word_count) {
cout << w.first << " occurs " << w.second << ((w.second > 1) ? " times" : " time") << endl;
}
return 0;
}
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#include <iostream>
#include <string>
#include <map>
#include <vector>
using namespace std;
void addFamily(map<string, vector<string>>& families, const string& surname) {
families[surname] = vector<string>();
}
void addChild(map<string, vector<string>>& families, const string& surname, const string& childName) {
families[surname].push_back(childName);
}
int main() {
map<string, vector<string>> families;
// 添加一个新的家庭
addFamily(families, "Smith");
// 向Smith家庭添加孩子
addChild(families, "Smith", "John");
addChild(families, "Smith", "Jane");
// 添加另一个家庭
addFamily(families, "Johnson");
// 向Johnson家庭添加孩子
addChild(families, "Johnson", "Emily");
addChild(families, "Johnson", "Ella");
// 打印家庭及其孩子
for (const auto& family : families) {
cout << "Family surname: " << family.first << endl;
cout << "Children: ";
for (const auto& child : family.second) {
cout << child << " ";
}
cout << endl;
}
return 0;
}
答:
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
vector<string> words;
string word;
while (cin >> word) {
// 使用 std::find 检查 word 是否已经在 vector 中
if (find(words.begin(), words.end(), word) == words.end()) {
words.push_back(word);
}
}
for (const auto &w : words) {
cout << w << endl;
}
return 0;
}
答:
map<string, list<int>> search;
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multiset<Sales_data, bool(*)(const Sales_data &, const Sales_data &)>bookstore(compareIsbn);
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#include <iostream>
#include <vector>
#include <string>
#include <utility>
using namespace std;
int main() {
vector<pair<string, int>> vec;
string str;
int num;
cout << "Enter pairs of string and int (Enter 'exit' as string to stop):" << endl;
while (true) {
cin >> str;
if (str == "exit") {
break;
}
cin >> num;
vec.push_back(make_pair(str, num));
}
cout << "Pairs in vector are:" << endl;
for (const auto &p : vec) {
cout << p.first << ": " << p.second << endl;
}
return 0;
}
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vec.push_back(pair<string, int>(str, num));
vec.push_back(make_pair(str, num));
vec.push_back({str, num});
答:
#include <iostream>
#include <string>
#include <map>
#include <vector>
using namespace std;
void addFamily(map<string, vector<pair<string, string>>>& families, const string& surname) {
families[surname] = vector<pair<string, string>>();
}
void addChild(map<string, vector<pair<string, string>>>& families, const string& surname
, const string& childName, const string& birthday) {
families[surname].push_back({ childName, birthday });
}
int main() {
map<string, vector<pair<string, string>>> families;
// 添加一个新的家庭
addFamily(families, "Smith");
// 向Smith家庭添加孩子
addChild(families, "Smith", "John", "2005-01-15");
addChild(families, "Smith", "Jane", "2008-06-20");
// 添加另一个家庭
addFamily(families, "Johnson");
// 向Johnson家庭添加孩子
addChild(families, "Johnson", "Emily", "2010-09-12");
addChild(families, "Johnson", "Ella", "2012-03-30");
// 打印家庭及其孩子
for (const auto& family : families) {
cout << "Family surname: " << family.first << endl;
cout << "Children: ";
for (const auto& child : family.second) {
cout << child.first << " (Birthday: " << child.second << ") ";
}
cout << endl;
}
return 0;
}
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#include <iostream>
#include <string>
#include <map>
int main() {
std::map<std::string, int> word_count;
word_count["hello"] = 1;
word_count["world"] = 2;
// 使用迭代器为 "hello" 对应的 value 赋新值
std::map<std::string, int>::iterator it = word_count.find("hello");
if (it != word_count.end()) {
it->second = 9; // 使用迭代器修改value
}
for (const auto &item : word_count) {
std::cout << item.first << ": " << item.second << std::endl;
}
return 0;
}
copy(v.begin(), v.end(), inserter(c, c.end()));
copy(v.begin(), v.end(), back_inserter(c));
copy(c.begin(), c.end(), inserter(v, v.end()));
copy(c.begin(), c.end(), back_inserter(v));
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map<string, size_t>::const_iterator map_it
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multiset<Sales_data, bool(*)(const Sales_data &, const Sales_data &)>::iterator msetIt = bookstore.begin();
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#include <iostream>
#include <string>
#include <map>
using namespace std;
int main() {
map<string, size_t> word_count;
string word;
while (cin >> word) {
auto ret = word_count.insert({ word, 1 });
if (!ret.second)
++ret.first->second;
}
for (const auto &w : word_count) {
cout << w.first << " occurs " << w.second << ((w.second > 1) ? " times" : " time") << endl;
}
return 0;
}
while (cin >> word)
++word_count.insert({word, 0}).first->second;
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#include <iostream>
#include <string>
#include <map>
using namespace std;
void addChild(multimap<string, string>& families, const string& surname, const string& childName) {
families.insert({ surname, childName });
}
int main() {
multimap<string, string> families;
addChild(families, "Smith", "John");
addChild(families, "Smith", "Jane");
addChild(families, "Johnson", "Emily");
addChild(families, "Johnson", "Ella");
string current_family;
for (const auto& entry : families) {
if (current_family != entry.first) {
if (!current_family.empty()) {
cout << endl; // 把不同的家庭分开
}
cout << "Family surname: " << entry.first << endl;
current_family = entry.first;
cout << "Children: ";
}
cout << entry.second << " ";
}
return 0;
}
map<int, int> m;
m[0] = 1;
答:
vector<int> v;
v[0] = 1;
答:
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#include <iostream>
#include <string>
#include <map>
int main() {
// 定义一个map
std::map<std::string, int> word_count;
// 对map进行下标操作的类型:std::string
word_count[std::string("apple")] = 1;
// 下标运算符将会返回的类型:int
int apple_count = word_count["apple"];
std::cout << "apple: " << apple_count << std::endl; // 输出:apple: 1
return 0;
}
答:
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map<string, vector<int>> m;
map<string, vector<int>>::iterator it = m.find("hello");
答:
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#include <iostream>
#include <string>
#include <map>
using namespace std;
int main() {
multimap<string, string> authors;
// 初始化作者及其作品
authors.insert({ "Barth, John", "Sot-Weed Factor" });
authors.insert({ "Barth, John", "Lost in the Funhouse" });
authors.insert({ "Rowling, J.K.", "Harry Potter" });
authors.insert({ "Tolkien, J.R.R.", "The Lord of the Rings" });
string search_author, search_title;
cout << "Enter the author's name: ";
getline(cin, search_author);
cout << "Enter the title of the work: ";
getline(cin, search_title);
auto it = authors.find(search_author);
bool erased = false;
// 使用find在multimap中查找元素
while (it != authors.end() && it->first == search_author) {
if (it->second == search_title) {
authors.erase(it); // 删除找到的元素
erased = true;
break;
}
++it;
}
if (erased) {
cout << "The work titled '" << search_title << "' by " << search_author << " was erased." << endl;
} else {
cout << "The work titled '" << search_title << "' by " << search_author << " was not found." << endl;
}
return 0;
}
答:
#include <iostream>
#include <map>
#include <set>
#include <string>
using namespace std;
int main() {
multimap<string, string> authors;
// 插入作者和他们的作品
authors.insert({ "Austen, Jane", "Pride and Prejudice" });
authors.insert({ "Austen, Jane", "Emma" });
authors.insert({ "Tolkien, J.R.R.", "The Hobbit" });
authors.insert({ "Tolkien, J.R.R.", "The Silmarillion" });
authors.insert({ "Tolkien, J.R.R.", "The Lord of the Rings" });
authors.insert({ "Orwell, George", "1984" });
authors.insert({ "Orwell, George", "Animal Farm" });
// 当前正在处理的作者的名字
string current_author = "";
set<string> works; // 用于暂存当前作者的作品并按字典序排列
for (const auto &item : authors) {
if (current_author != item.first) {
if (!works.empty()) {
for (const auto &work : works) {
cout << "\t" << work << endl;
}
works.clear(); // 清空已打印的作品列表
}
current_author = item.first;
cout << current_author << ":\n";
}
works.insert(item.second);
}
// 打印最后一个作者的作品
for (const auto &work : works) {
cout << "\t" << work << endl;
}
return 0;
}
答:
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <map>
using namespace std;
map<string, string> buildMap(ifstream &map_file) {
map<string, string> trans_map;
string key;
string value;
while (map_file >> key && getline(map_file, value)) {
if (value.size() > 1) {
trans_map[key] = value.substr(1);
} else {
throw runtime_error("no rule for " + key);
}
}
return trans_map;
}
const string &transform(const string &s, const map<string, string> &m) {
auto map_it = m.find(s);
if (map_it != m.cend()) {
return map_it->second;
} else {
return s;
}
}
void word_transform(ifstream &map_file, ifstream &input) {
auto trans_map = buildMap(map_file);
string text;
while (getline(input, text)) {
istringstream stream(text);
string word;
bool firstword = true;
while (stream >> word) {
if (firstword) {
firstword = false;
} else {
cout << " ";
}
cout << transform(word, trans_map);
}
cout << endl;
}
}
int main() {
ifstream mapRule("rule.txt"), strText("input.txt");
if (!mapRule&&!strText) {
std::cerr << "Can not open the file!" << std::endl;
return -1;
}
word_transform(mapRule, strText);
return 0;
}
答:
trans_map[key] = value.substr(1);
改为 trans_map.insert({ key, value.substr(1) })
答:
答:
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答:
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std;
int main() {
unordered_map<string, size_t> word_count; // 使用unordered_map而不是map
string word;
while (cin >> word) {
++word_count[word];
}
for (const auto &w : word_count) {
cout << w.first << " occurs " << w.second << ((w.second > 1) ? " times" : " time") << endl;
}
return 0;
}
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <unordered_map>
using namespace std;
unordered_map<string, string> buildMap(ifstream &map_file) {
unordered_map<string, string> trans_map;
string key;
string value;
while (map_file >> key && getline(map_file, value)) {
if (value.size() > 1) {
trans_map[key] = value.substr(1);
} else {
throw runtime_error("no rule for " + key);
}
}
return trans_map;
}
const string &transform(const string &s, const unordered_map<string, string> &m) {
auto map_it = m.find(s);
if (map_it != m.cend()) {
return map_it->second;
} else {
return s;
}
}
void word_transform(ifstream &map_file, ifstream &input) {
auto trans_map = buildMap(map_file);
string text;
while (getline(input, text)) {
istringstream stream(text);
string word;
bool firstword = true;
while (stream >> word) {
if (firstword) {
firstword = false;
} else {
cout << " ";
}
cout << transform(word, trans_map);
}
cout << endl;
}
}
int main() {
ifstream mapRule("rule.txt"), strText("input.txt");
if (!mapRule && !strText) {
std::cerr << "Can not open the file!" << std::endl;
return -1;
}
word_transform(mapRule, strText);
return 0;
}
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