#10818

i) array 사용X

#include <iostream>
using namespace std;

int main() 
{
	int N;
	int min = 1000001;
	int max = -1000001;
	int X = 0;

	cin >> N;

	if (N < 1 || N >1000000)
		return 0;

	for (int i = 0; i < N; i++) {
		cin >> X;

		if (X > max)
			max = X;

		if (X < min)
			min = X;
	}

	cout << min << " " << max;
}

ii) array 사용 (new, delete 사용)

#include <iostream>
#include <algorithm>

using namespace std;

int main() {

	int N;
	cin >> N;
	int* arr = new int[N];

	for (int i = 0; i < N; i++) {
		cin >> arr[i];
	}

	sort(arr, arr + N);

	cout << arr[0] << " " << arr[N - 1];

	delete[] arr;

	return 0;

}

#2562

#include <iostream>
using namespace std;

int main() {

	int X;
	int max = 0;
	int count = 0;

	for (int i = 0; i < 9; i++) {
		cin >> X;

		if (X > max) {
			max = X;
			count = i+1;
		}
	}

	cout << max << "\n";
	cout << count;

	return 0;
}

#2577

i) 나머지를 이용하여 구하기

#include <iostream>
using namespace std;

int main() {
	int A, B, C;
	int res = 0;
	int arr[10] = {};

	cin >> A >> B >> C;

	res = A * B * C;

	while (res != 0) {
		arr[res % 10]++;
		res /= 10;
	}

	for (int i = 0; i < 10; i++)
		cout << arr[i] << "\n";

	return 0;
}

ii) 문자열을 이용하여 구하기 '0'

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

int main() {
	int A, B, C;
	int res = 0;
	int arr[10] = {};

	cin >> A >> B >> C;

	res = A * B * C;

	/************** 암기하기 *************/
	string str = to_string(res);
	for (char ch : str) {
		arr[ch - '0']++;
	}
	/************************************/

	for (int i = 0; i < 10; i++)
		cout << arr[i] << "\n";

	return 0;
}

#3052

#include <iostream>
using namespace std;

int main() {
	int N[10] = {};
	int arr[42] = {};
	int count = 0;

	for (int i = 0; i < 10; i++) {
		cin >> N[i];
	}

	for (int i = 0; i < 10; i++) {
		arr[N[i] % 42]++;
	}

	for (int i = 0; i < 42; i++) {
		if (arr[i] >= 1)
			count++;
	}

	cout << count;
}

#1546

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

int main() {
	int N = 0;
	cin >> N;
	double *arr = new double[N];
	double sum = 0;

	for (int i = 0; i < N; i++) {
		cin >> arr[i];
	}

	sort(arr, arr + N);

	for (int i = 0; i < N; i++) {
		arr[i] = arr[i] / arr[N-1] * 100;
		sum += arr[i];
	}

	cout << sum / N;
    delete[] arr;
}

#8958

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

int score(string &s) {
	int hit = 0;
	int sum = 0;

	for (char &ch : s) {
		if (ch == 'O') {
			hit++;
			sum += hit;
		}
		else {
			hit = 0;
		}
	}

	return sum;
}


int main() {
	int N;
	cin >> N;

	int result;
	string str;

	for (int i = 0; i < N; i++) {
		cin >> str;
		result = score(str);

		cout << result << "\n";
	}
}

#4344

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

int main() {
	int C, N;
	cin >> C;

	for (int j = 0; j < C; j++) {

		cin >> N;

		if (N < 1 || N > 1000)
			return 0;

		int* arr = new int[N];

		double sum = 0;
		double cnt = 0;

		for (int i = 0; i < N; i++) {
			cin >> arr[i];
		}

		for (int i = 0; i < N; i++) {
			sum += arr[i];
		}

		sum = sum / N;

		for (int i = 0; i < N; i++) {
			if (arr[i] > sum)
				cnt++;
		}

		cnt = (cnt / N) * 100;
		cout << fixed;
		cout.precision(3);
		cout << cnt << "%" <<"\n";
	}
}

소숫점 자리 고정
cout << fixed; >> 소수점을 고정시켜 표현
cout.precision(3); >> 소숫점 3자리까지 표현