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Codeforces Beta Round #87 (Div. 2) / 116D Lawnmower (讨论情况)


http://codeforces.com/problemset/problem/116/D


/*30ms,0KB*/

#include<cstdio>
const int mx = 155;

char g[mx][mx];
int left[mx], right[mx];

int main()
{
	int n, m, i, j, posy, dir;
	int cnt = -1;
	scanf("%d%d", &n, &m);
	int maxn = 0;
	for (i = 1; i <= n; ++i)
	{
		getchar();
		for (j = 1; j <= m; ++j)
		{
			g[i][j] = getchar();
			if (g[i][j] == 'W')
			{
				if (left[i] == 0) left[i] = j;
				right[i] = j;
				maxn = i;
			}
		}
	}
	posy = 1;
	dir = 0; ///左
	///一开始在n=0,posy=1处
	for (i = 1; i <= maxn; ++i)
	{
		if (dir)///右
		{
			if (right[i] && right[i] > posy) cnt += right[i] - posy + right[i] - left[i] + 1;
			else if (left[i] && left[i] < posy) cnt += posy - left[i] + 1;
			else ++cnt;
			if (left[i]) posy = left[i];
		
		}
		else///左
		{
			if (left[i] && left[i] < posy) cnt += posy - left[i] + right[i] - left[i] + 1;
			else if (right[i] > posy) cnt += right[i] - posy + 1;
			else ++cnt;
			if (right[i]) posy = right[i];
		
		}
		dir=!dir;
	}
	if (cnt == -1) cnt = 0;
	printf("%d\n", cnt);
	return 0;
}


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