Luogu2543[AHOI2004]奇怪的字符串 (动态规划 LCS)

04年的省选这么water吗，开个滚动数组算了

#include <iostream>

#include <cstdio>

#include <cstring>

#include <algorithm>

#include <cmath>

#define R(a,b,c) for(register int  a = (b); a <= (c); ++ a)

#define nR(a,b,c) for(register int  a = (b); a >= (c); -- a)

#define Max(a,b) ((a) > (b) ? (a) : (b))

#define Min(a,b) ((a) < (b) ? (a) : (b))

#define Fill(a,b) memset(a, b, sizeof(a))

#define Swap(a,b) a^=b^=a^=b

#define ll long long

#define ON_DEBUG

#ifdef ON_DEBUG

#define D_e_Line printf("\n\n----------\n\n")

#define D_e(x)  cout << #x << " = " << x << endl

#define Pause() system("pause")

#else

#define D_e_Line ;

#endif

struct ios{

    template<typename ATP>ios& operator >> (ATP &x){

        x = 0; int f = 1; char c;

        for(c = getchar(); c < '0' || c > '9'; c = getchar()) if(c == '-')  f = -1;

        while(c >= '0' && c <= '9') x = x * 10 + (c ^ '0'), c = getchar();

        x*= f;

        return *this;

    }

}io;

using namespace std;

const int N = 10007;

char a[N], b[N];

int f[2][N];

int main(){

    scanf("%s%s", a, b);

    int lenA = strlen(a), lenB = strlen(b);

    R(i,1,lenA)

    	R(j,1,lenB){

    	    if(a[i-1] == b[j-1])

				f[i&1][j] = f[(i-1)&1][j-1] + 1;

    		else

				f[i&1][j] = Max(f[(i-1)&1][j], f[i&1][j-1]);

    	}

	printf("%d", f[lenA&1][lenB]);

	return 0;

}

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Luogu2543[AHOI2004]奇怪的字符串 (动态规划 LCS)

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