题目大意:求两个字符串的最长公共子序列。
解题思路:套用dp的状态转移方程。
#include <stdio.h>
#include <string.h>
const int N = 1005;
int max(const int& x, const int& y) { return x > y ? x : y; }
int n, m, dp[N][N];
char a[N], b[N];
int main() {
int cas = 1;
while (gets(a)) {
if (strcmp(a, "#") == 0) break;
gets(b);
n = strlen(a);
m = strlen(b);
memset(dp, 0, sizeof(dp));
for (int i = 1; i <= n; i++)
for (int j = 1; j <= m; j++) {
if (a[i - 1] == b[j - 1])
dp[i][j] = dp[i - 1][j - 1] + 1;
else
dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
}
printf("Case #%d: you can visit at most %d cities.\n", cas++, dp[n][m]);
}
return 0;
}