1：蓝桥杯打题

 

 

#include
#include
#include
using namespace std;
int n;
int arr[110];
bool use[110];
int ans = -1;
int maxx = 0;
int main()
{
	cin >> n;
	for (int i = 1;i <= n;i++)
	{
		cin >> arr[i];
		maxx += arr[i];
	}
	for (int i = 1;i <= n;i++)
	{
		int flag = 1;
		int pos = i;
		int ans1 = 0;
		memset(use, 1, sizeof(use));
		while (1)
		{
			if (pos == n + 1)
			{
				pos = 1;
			}
			if (arr[pos] == flag&&use[pos]==1)
			{
				ans1 += flag;
				flag = 1;
				use[pos] = 0;
			}
			else if(use[pos]==1)
			{
				flag++;
			}
			pos++;
			if (flag > n || ans1 >= maxx)
			{
				break;
			}
		}
		ans = max(ans1, ans);
	}
	cout << ans << endl;
	return 0;
}

 

#include
using namespace std;
#include
#include
#include
#include
int main()
{
	int n;
	cin >> n;
	for (int i = 0;i * i <= n;i++)
	{
		for (int j = i;i * i + j * j <= n;j++)
		{
			for (int z = j;i * i + j * j + z * z <= n;z++)
			{
				int x = sqrt(n - (i * i + j * j + z * z));
				int y = n - i * i - j * j - z * z;
				if (x * x == y)
				{
					cout << i << " " << j << " " << z << " " << x << endl;
					return 0;
				}
			}
		}
	}
	return 0;
}

 

#include
#include
using namespace std;
int main()
{
	int n;
	cin >> n;
	long long ans = 0;
	for (int i = 1;i <= n;i++)
	{
		int num = i;
		while (num)
		{
			int flag = num % 10;
			if (flag == 0 || flag == 2 || flag == 1 || flag == 9)
			{
				ans += i;
				break;
			}
			num /= 10;
		}
	}
	cout << ans << endl;
	return 0;
}

 

#include
#include
#include
#include
using namespace std;
int main()
{
	long long n;
	long long ans = 0;
	long long mod = 1e9 + 7;
	cin >> n;
	n--;
	for (int i = 1;i <= n;i++)
	{
		ans += (n - i + 1) * (n - i + 1);
		ans += (n - i + 1) * (n - i + 1) * (i - 1);
		ans %= mod;
	}
	cout << ans << endl;
	return 0;
}

 

 

#include
using namespace std;
#include
#include
#include
int main()
{
	int n;
	cin >> n;
	for (int i = 1;i <= n;i++)
	{
		cout << max((i-1)*2, (n - i) * 2 )<< endl;
 
	}
	return 0;
}

 

#include
using namespace std;
#include
#include
#include
#include
int n;
void f2(int x)
{
	if (x <= 9)
	{
		cout << x;
	}
	else
	{
		cout << char(x + 55);
	}
	return;
}
void f(int i,int j)
{
	int num = i * j;
	vector<int>v;
	while (num)
	{
		v.push_back(num % n);
		num /= n;
	}
	while (!v.empty())
	{
		vector<int>::iterator pos = v.end();
		pos--;
		f2(*pos);
		v.erase(pos);
	}
	return;
}
int main()
{
	cin >> n;
	for (int i = 1;i < n;i++)
	{
		for (int j = 1;j <= i;j++)
		{
			f2(i);
			cout << "*";
			f2(j);
			cout << "=";
			f(i, j);
			cout<< " ";
		}
		cout << endl;
	}
	return 0;
}

 

 

#include
#include
#include
using namespace std;
int n;
int const N= 1e5 + 10;
int use[N];
int main()
{
	cin >> n;
	memset(use, 0, sizeof(use));
	int num;
	for (int i = 1;i <= n;i++)
	{
		cin >> num;
		use[num]++;
	}
	int n1 = 0;
	int n2 = 0;
	for (int i = 1;i <= n;i++)
	{
		if (use[i] > 2)
		{
			n1 += (use[i] - 2);
		}
		else if (use[i] == 1)
		{
			n2++;
		}
	}
	int ans = max(n1, (n1 + n2) / 2);
	cout << ans << endl;
	return 0;
}

 

#include
using namespace std;
#include
int const N = 1e5 + 10;
pair<int, int> pii[N];
int main()
{
	int n, k;
	cin >> n >> k;
	for (int i = 1;i <= n;i++)
	{
		cin >> pii[i].first >> pii[i].second;
	}
	int left = 1;
	int right = 1e5;
	int mid;
	int ans = -1;
	while (left <= right)
	{
		mid = (left + right) / 2;
		int res = 0;
		for (int i = 1;i <= n;i++)
		{
			res += (pii[i].first / mid) * (pii[i].second / mid);
			if (res > k)break;
		}
		if (res >= k)
		{
			ans = max(ans, mid);
			left = mid + 1;
		}
		else
		{
			right = mid - 1;
		}
	}
	cout << ans << endl;
	return 0;
}