牛客刷题 - 腾讯2017暑期实习笔试（LCS & 暴力 & 计数）

#include<cstdio>
#include<stack>
#include<queue>
#include<cmath>
#include<vector>
#include<cstring>
#include<algorithm>
using namespace std;
#define CLR(a,b) memset(a,b,sizeof(a))
#define INF 0x3f3f3f3f
#define LL long long
int dp[1005][1005];
int LCS(char str[], char re[], int l)
{
	for (int i = 0 ; i <= l ; i++)
		dp[i][0] = dp[0][i] = 0;
	for (int i = 1 ; i <= l ; i++)
	{
		for (int j = 1 ; j <= l ; j++)
		{
			if (str[i-1] == re[j-1])
				dp[i][j] = dp[i-1][j-1] + 1;
			else
				dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
		}
	}
	return dp[l][l];
}
int main()
{
	char str[1005];
	char re[1005];
	int l;
	while(~scanf("%s",str))
	{
		l = strlen(str);
		for (int i=0, j=l-1 ; i < l ; i++, j--)
			re[i] = str[j];
		re[l] = '\0';
		printf("%d\n",l-LCS(str,re,l));
	}
	return 0;
}

#include <cstdio>
#include <stack>
#include <queue>
#include <cmath>
#include <vector>
#include <cstring>
#include <algorithm>
using namespace std;
#define CLR(a,b) memset(a,b,sizeof(a))
#define INF 0x3f3f3f3f
#define LL long long
bool isUpper(char c)
{
	if (c >= 'A' && c <= 'Z')
		return true;
	return false;
}
int main()
{
	char str[1005];
	while(~scanf("%s",str))
	{
		int l = strlen(str);
		int cnt = 0;		//大写字母数
		for (int i = 0 ; i < l ; i++)
		{
			if (isUpper(str[i]))
				cnt++;
			else
			{
				char temp = str[i];
				for (int j=0, pos=i ; j < cnt ; j++, pos--)
					str[pos] = str[pos-1];
				str[i-cnt] = temp;
			}
		}
		printf("%s\n",str);
	}
	return 0;
}

#include <cstdio>
#include <stack>
#include <queue>
#include <cmath>
#include <vector>
#include <cstring>
#include <algorithm>
using namespace std;
#define CLR(a,b) memset(a,b,sizeof(a))
#define INF 0x7fffffff
#define LL long long
int n;
int num[100000+5];
int main()
{
	while(~scanf("%d",&n))
	{
		for (int i = 0 ; i < n ; i++)
			scanf("%d",&num[i]);
		sort(num, num+n);
		pair<int, int> ans1(INF, 0);
		pair<int, int> min_num(INF, 0);
		pair<int, int> max_num(-1, 0);
		for (int i = 0 ; i < n ; i++)
		{
			//统计最小差 
			if (i != 0)
			{
				if (num[i]-num[i-1] == ans1.first)
					ans1.second++;
				else if (num[i]-num[i-1] < ans1.first)
				{
					ans1.first = num[i]-num[i-1];
					ans1.second = 1;
				}
			}
			
			//统计最大最小值
			if (num[i] == min_num.first)
				min_num.second++;
			else if (num[i] < min_num.first)
			{
				min_num.first = num[i];
				min_num.second = 1;
			}
			if (num[i] == max_num.first)
				max_num.second++;
			else if (num[i] > max_num.first)
			{
				max_num.first = num[i];
				max_num.second = 1;
			}
		}
		LL p1, p2;
		p1 = p2 = 0;
		if (ans1.first == 0)
		{
			ans1.first = num[0];
			ans1.second = 1;
			for (int i = 1 ; i < n ; i++)
			{
				if (num[i] == ans1.first)
					ans1.second++;
				else
				{
					p1 += (LL)ans1.second*(ans1.second-1)/2;
					ans1.first = num[i];
					ans1.second = 1;
				}
			}
			p1 += (LL)ans1.second*(ans1.second-1)/2;
		}
		else
			p1 = ans1.second;
		if (max_num.first == min_num.first)
			p2 = (LL)min_num.second*(min_num.second-1);
		else
			p2 = (LL)min_num.second*max_num.second;
		printf("%lld %lld\n",p1,p2);
	}
	return 0;
}