一本通 1276：【例9.20】编辑距离

编辑距离

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Code:

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
//Mystery_Sky
//
#define INF 0x3f3f3f3f
#define M 3000
int f[M][M];
int len_a, len_b;
char a[M], b[M];
int main() {
	scanf("%s", a);
	getchar();
	scanf("%s", b);
	len_a = strlen(a);
	len_b = strlen(b);
	for(int i = 1; i <= len_a; i++) f[i][0] = i;
	for(int i = 1; i <= len_b; i++) f[0][i] = i; 
	for(int i = 1; i <= len_a; i++) {
		for(int j = 1; j <= len_b; j++) {
			if(a[i-1] == b[j-1]) {
				f[i][j] = f[i-1][j-1];
			}
			else f[i][j] = min(min(f[i-1][j], f[i][j-1]), f[i-1][j-1]) + 1;
		}
	}
	printf("%d\n", f[len_a][len_b]);
	return 0;
}