코딩테스트 연습 - 기초트레이닝(LV 0)

5년전에 했던건가?ㅋㅋ 아직도 남아있네

LV 0. 문자열 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/181952

#include <iostream>
#include <string>

using namespace std;

int main(void) {
    ios_base :: sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    
    string str;
    cin >> str;
    cout << str;
    return 0;
}

 

LV 0. a와 b 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/181951

#include <iostream>
#include <string>
using namespace std;

void print(string s, int n) {
    cout << s << " = " << n << endl;
}
int main(void) {
    int a;
    int b;
    cin >> a >> b;
    print("a", a);
    print("b", b);
    return 0;
}

 

LV 0. 문자열 반복해서 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/181950

#include <iostream>
#include <string>

using namespace std;

int main(void) {
    string str;
    int n;
    cin >> str >> n;
    for(int i=0; i<n; ++i) {
        cout << str;
    }
    return 0;
}

 

LV 0. 대소문자 바꿔서 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/181949

#include <iostream>
#include <string>

using namespace std;

int main(void) {
    string str; cin >> str;
    for(int i=0; i<str.size(); i++) {
        char word = str[i];
        if (word >= 'a' && word <= 'z') {
            str[i] -= 32;
        }
        else {
            str[i] += 32;
        }
    }
    
    cout << str;
    return 0;
}

 

LV 0. 특수문자 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/181948

#include <iostream>

using namespace std;

int main(void) {
    cout << R"(!@#$%^&*(\'"<>?:;)";
    return 0;
}

 

LV 0. 덧셈식 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/181947

#include <iostream>

using namespace std;

int main(void) {
    int a;
    int b;
    cin >> a >> b;
    int c = a + b;
    cout << a << " + " << b << " = " << c;
    return 0;
}

 

LV 0. 문자열 붙여서 출력하기

이건 어째 문제가좀 이상한데.... 공백문자가 input 으로 들어오던지 해서 파싱을 하던지 해야는데 좀그렇네

https://school.programmers.co.kr/learn/courses/30/lessons/181946

#include <iostream>
#include <string>

using namespace std;

void print(string s) {
    for(auto a:s) {
        if( a == ' ') {
            break;
        }
        cout << a;
    }
}
int main(void) {
    string str1, str2;
    cin >> str1 >> str2;
    print(str1 + str2);
    return 0;
}

 

LV 0. 문자열 돌리기

https://school.programmers.co.kr/learn/courses/30/lessons/181945

#include <iostream>
#include <string>

using namespace std;

int main(void) {
    string str;
    cin >> str;
    for(auto a:str) {
        cout << a << endl;
    }
    return 0;
}

 

LV 0. 홀짝 구분하기

https://school.programmers.co.kr/learn/courses/30/lessons/181944

#include <iostream>

using namespace std;

int main(void) {
    int n;
    cin >> n;
    
    if (n & 1) {
        cout << n << " is odd";
    }
    else {
        cout << n << " is even";
    }
    return 0;
}

 

LV 0. 문자열 겹쳐쓰기

https://school.programmers.co.kr/learn/courses/30/lessons/181943

#include <string>
#include <vector>

using namespace std;

string solution(string my_string, string overwrite_string, int s) {
    for (int i = 0; i < overwrite_string.size(); i++) {
        my_string[i+s] = overwrite_string[i];
    }
    return my_string;
}

 

LV 0. 접두사인지 확인하기

https://school.programmers.co.kr/learn/courses/30/lessons/181906

#include <string>
#include <vector>

using namespace std;

int solution(string my_string, string is_prefix) {
    int answer = 0;
    
    if (is_prefix.size() > my_string.size()) {
        return 0;
    }
    
    for(int i = 0; i < is_prefix.size(); i++) {
        if (my_string[i] != is_prefix[i]) {
            return 0;
        }
    }
    return 1;
}

 

LV 0. 카운트 다운

https://school.programmers.co.kr/learn/courses/30/lessons/181899

#include <string>
#include <vector>

using namespace std;

vector<int> solution(int start, int end_num) {
    vector<int> answer;
    for(int i=start; i >= end_num; --i) {
        answer.push_back(i);
    }
    return answer;
}

 

LV 0. n 번째 원소부터

https://school.programmers.co.kr/learn/courses/30/lessons/181892

#include <string>
#include <vector>

using namespace std;

vector<int> solution(vector<int> num_list, int n) {
    vector<int> answer;
    
    for(int i=n-1; i<num_list.size(); i++)
        answer.push_back(num_list[i]);
    return answer;
}

 

LV 0. 공배수

https://school.programmers.co.kr/learn/courses/30/lessons/181936

#include <string>
#include <vector>

using namespace std;

int solution(int number, int n, int m) {
    if (number % n == 0 && number % m == 0) 
        return 1;
    return 0;
}

 

LV 0. 문자열 섞기

https://school.programmers.co.kr/learn/courses/30/lessons/181942

#include <string>
#include <vector>

using namespace std;

string solution(string str1, string str2) {
    string answer = "";
    for(int i=0; i< str1.size(); i++) {
        answer+=str1[i];
        answer+=str2[i];
    }
    return answer;
}

 

LV 0. 문자 리스트를 문자열로 변환하기

https://school.programmers.co.kr/learn/courses/30/lessons/181941

#include <string>
#include <vector>
#include <algorithm>
using namespace std;

string solution(vector<string> arr) {
    string answer = "";
    for(auto s:arr){
        answer+=s;
    }
    return answer;
}

 

LV 0. 문자열 곱하기

https://school.programmers.co.kr/learn/courses/30/lessons/181940

#include <string>
#include <vector>

using namespace std;

string solution(string my_string, int k) {
    string answer = "";
    for(int i=0; i<k; i++) 
        answer += my_string;
    return answer;
}

 

LV 0. n의 배수

https://school.programmers.co.kr/learn/courses/30/lessons/181937

#include <string>
#include <vector>

using namespace std;

int solution(int num, int n) {
    if (num % n == 0) {
        return 1;
    }
    
    return 0;
}

 

LV 0. 더 크게 합치기

https://school.programmers.co.kr/learn/courses/30/lessons/181939

#include <string>
#include <vector>

using namespace std;

int solution(int a, int b) {
    string s1 = to_string(a);
    string s2 = to_string(b);
    string s3 = s1 + s2;
    string s4 = s2 + s1;
    if (stoi(s3) > stoi(s4)) {
        return stoi(s3);
    }
    return stoi(s4);
}