【优化】Codeforces Beta Round #1 / 1B Spreadsheets (字符串处理)

B. Spreadsheets

http://codeforces.com/problemset/problem/1/B

time limit per test

10 seconds

memory limit per test

64 megabytes

input

standard input

output

standard output

In the popular spreadsheets systems (for example, in Excel) the following numeration of columns is used. The first column has number A, the second — number B, etc. till column 26 that is marked by Z. Then there are two-letter numbers: column 27 has number AA, 28 — AB, column 52 is marked by AZ. After ZZ there follow three-letter numbers, etc.

The rows are marked by integer numbers starting with 1. The cell name is the concatenation of the column and the row numbers. For example, BC23 is the name for the cell that is in column 55, row 23.

Sometimes another numeration system is used: RXCY, where X and Y are integer numbers, showing the column and the row numbers respectfully. For instance, R23C55 is the cell from the previous example.

Your task is to write a program that reads the given sequence of cell coordinates and produce each item written according to the rules of another numeration system.

Input

The first line of the input contains integer number n (1 ≤ n ≤ 10⁵), the number of coordinates in the test. Then there follow n lines, each of them contains coordinates. All the coordinates are correct, there are no cells with the column and/or the row numbers larger than 10⁶ .

Output

Write n lines, each line should contain a cell coordinates in the other numeration system.

Sample test(s)

input

2
R23C55
BC23

output

BC23
R23C55

比较下下面两个代码的不同之处~

完整代码：

/*186ms,0KB*/

#include<cstdio>
#include<cstring>
#include<cstdlib>

char str[17], col[8];

int main()
{
	int n, c, temp;
	bool hasc;
	scanf("%d", &n);
	while (n--)
	{
		memset(str, 0, sizeof(str));
		memset(col, 0, sizeof(col));
		scanf("%s", str);
		int len = strlen(str), i = 2, j = 0;
		hasc = false;
		for (; i < len; ++i) ///从2开始找'C'
		{
			if (str[i] == 'C')
			{
				if (str[i - 1] >= '0' && str[i - 1] <= '9')
					hasc = true;
				break;
			}
		}
		if (hasc) ///RXCY格式 转 字母+数字格式
		{
			///提取colnum
			for (j = i + 1; j < len; ++j)
				col[j - i - 1] = str[j];
			c = atoi(col);///#include<cstdlib>
			///10进制转26进制，最后逆序输出
			memset(col, 0, sizeof(col));
			j = 0;
			while (c > 26)
			{
				temp = c % 26;
				if (temp == 0)
					temp = 26;
				col[j++] = '@' + temp;
				c = (c - temp) / 26;
			}
			col[j] = '@' + c;
			for (; j >= 0; --j)
				printf("%c", col[j]);
			for (j = 1; j < i; ++j)
				printf("%c", str[j]);
		}
		else///字母+数字格式 转 RXCY格式
		{
			putchar('R');
			for (; str[j] > '@'; ++j)
				;
			temp = j - 1;
			for (; j < len; ++j)
				printf("%c", str[j]);
			putchar('C');
			c = 0;
			for (int index = 1; temp >= 0; --temp, index *= 26)
				c += (str[temp] - '@') * index;
			printf("%d", c);
		}
		printf("\n");
	}
	return 0;
}

更快的代码：

/*46ms,0KB*/

#include <cstdio>

char s[15], c;

int num(int b, int l)
{
	int temp = 0;
	for (int i = b; i < l; ++i)
		temp = temp * 10 + s[i] - '0';
	return temp;
}

int pow(int x, int y)
{
	int temp = 1;
	for (int i = 0; i < y; ++i)
		temp *= x;
	return temp;
}

int main()
{
	int n;
	scanf("%d\n", &n);
	while (n--)
	{
		int l = 0, f = 0;
		while ((c = getchar()) != '\n')
		{
			s[l++] = c;
			if (s[l - 2] >= '0' && s[l - 2] <= '9' && c > '9')
				f = l - 1;
		}
		if (f)
		{
			int temp = num(f + 1, l);
			l = f;
			while (temp > 0)
			{
				c = temp % 26 + '@';
				if (c == '@')
				{
					--temp;
					c = 'Z';
				}
				s[++l] = c;
				temp /= 26;
			}
			for (int i = l; i > f; --i)
				putchar(s[i]);
			for (int i = 1; i < f; ++i)
				putchar(s[i]);
			putchar('\n');
		}
		else
		{
			putchar('R');
			while (s[++f] > '9');
			for (int i = f; i < l; ++i)
				putchar(s[i]);
			int temp = 0;
			for (int i = 0; i < f; ++i)
				temp += (s[i] - '@') * pow(26, f - i - 1);
			printf("C%d", temp);
			putchar('\n');
		}
	}
	return 0;
}