531 - Compromise

Time limit: 3.000 seconds 

http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem&problem=472


注意用一个全局变量flag来确定是否输出空格。


完整代码：

/*0.029s*/

#include<bits/stdc++.h>
using namespace std;

char a[105][35], b[105][35];
int dp[105][105], path[105][105];
bool first;///建议用全局变量调整空格的输出与否

void printlcs(int i, int j)
{
	if (i == 0 || j == 0) return;
	if (path[i][j] == 1)
	{
		printlcs(i - 1, j - 1);
		if (first)
		{
			printf("%s", a[i]);
			first = false;
		}
		else printf(" %s", a[i]);
	}
	else if (path[i][j] == 2) printlcs(i - 1, j);
	else printlcs(i, j - 1);
}

int main()
{
	int lena, lenb, i, j;
	while (~scanf("%s", a[1]))
	{
		if (a[1][0] != '#')
			for (lena = 2; scanf("%s", a[lena]), a[lena][0] != '#'; ++lena)
				;
		for (lenb = 1; scanf("%s", b[lenb]), b[lenb][0] != '#'; ++lenb)
			;
		memset(dp, 0, sizeof(dp));
		for (i = 1; i < lena; ++i)
			for (j = 1; j < lenb; ++j)
			{
				if (strcmp(a[i], b[j]) == 0)
					dp[i][j] = dp[i - 1][j - 1] + 1, path[i][j] = 1;
				else if (dp[i - 1][j] >= dp[i][j - 1])
					dp[i][j] = dp[i - 1][j], path[i][j] = 2;
				else
					dp[i][j] = dp[i][j - 1], path[i][j] = 3;
			}
		first = true;
		printlcs(lena - 1, lenb - 1);
		putchar(10);
	}
	return 0;
}