POJ - 1458 - Common Subsequence (LCS)

#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <cmath>
#include <queue>
#include <stack>
#include <vector>
#include <map>
#include <set>
#include <deque>
#include <cctype>
#define LL long long
#define INF 0x7fffffff
using namespace std;

char s[205];
char t[205];
int dp[205][205];

int main() {
	while(scanf("%s %s", s + 1, t + 1) != EOF) {
		int ls = strlen(s + 1);
		int lt = strlen(t + 1);
		memset(dp, 0, sizeof(dp));
		for(int i = 1; i <= ls; i ++) {
			for(int j = 1; j <= lt; j ++) {
				if(s[i] == t[j]) {
					dp[i][j] = dp[i - 1][j - 1] + 1;
				}
				else {
					dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
				}
			}
		}
		cout << dp[ls][lt] << endl;
	}
	return 0;
}