ACM常见格式提取代码

1. 读入数字后再读入含空格的字符串

int n; cin>>n;
cin.ignore();
vector<string> strs(n);
for(int i=0;i<n;i++)
    getline(cin,strs[i])

2. 读入未知长度的数字

vector<int> nums;
int a;
while(cin>>a){
    nums.push_back(a);
    if(cin.get()=='\n') break;
}

3. 提取.划分的字符串

vector<string> tokens;
istringstream iss(input);
string token;
while (getline(iss, token, '.')) 
    tokens.push_back(token);

4. 提取指定范围符号内用逗号隔开数字

vector<int> trans(string &str){
    size_t start = str.find('[');
    size_t end = str.find(']');
    string numStr = str.substr(start + 1, end - start - 1);
    stringstream ss(numStr);
    int number;
    vector<int> numbers;
    while (ss >> number) {
        numbers.push_back(number); // 将提取到的数字添加至 vector 容器中
        if (ss.peek() == ',') 
            ss.ignore(); // 忽略逗号分隔符
    }
    return numbers;
}

5. 提取字符串内的24时制时间

转化为分钟

int time_trans(string time){
    stringstream ss(time);
    int hours, minutes;
    char delimiter;
    ss >> hours >> delimiter >>noskipws >> minutes;
    return hours*60 + minutes;
}

6. 正则表达式提取日期字符串

regex pattern("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}");

string feature(string &s){
    smatch matches;
    regex_search(s, matches, pattern);
    return matches[0];
}