字符串编辑距离

#include <iostream>
using namespace std;

#include <string.h>

#define N 100
int matrix[N][N];
int penalty = 10;

int MinOf3(int x, int y, int z) {
    x = x < y ? x : y;
    return x < z ? x : z;
}

int MinOf2(int x, int y)
{
    return x < y ? x : y;
}
int Distance(const char * p1, const char * p2)
{
    int l1 = strlen(p1);
    int l2 = strlen(p2);
    int i, j;
    matrix[0][0] = 0;
    for (i = 1; i <= l1; ++i) {
        matrix[i][0] = i * penalty;
    }
    for (j = 1; j <= l2; ++j) {
        matrix[0][j] = j * penalty;
    }
    
    for (i = 1; i <= l1; ++i) {
        for (j = 1; j <= l2; ++j) {
            if (p1[i - 1] == p2[j - 1]) {
                matrix[i][j] = matrix[i - 1][j - 1];
            } else {
            matrix[i][j] = MinOf3(matrix[i - 1][j], matrix[i][j - 1],
                            matrix[i - 1][j - 1]) + penalty;
            }
        }
    }

    return matrix[l1][l2];
}

void Print(int n1, int n2)
{
    int i, j;
    for (i = 0; i <= n1; ++i) {
        for (j = 0; j <= n2; ++j) {
            printf("%3d", matrix[i][j]);
        }
        printf("\n");
    }
}

int main()
{
    cout << Distance("abc", "ab") << endl;
    Print(3, 2);

    return 0;
}