distance[i][j] = minimum(distance[i - 1][j] + 1, distance[i][j - 1] + 1, distance[i - 1][j - 1] + cost);
distance[i][j] = minimum(distance[i - 1][j] + 1, distance[i][j - 1] + 1, distance[i - 1][j - 1] + cost);
distance[i][j] = minimum(distance[i - 1][j] + 1, distance[i][j - 1] + 1, distance[i - 1][j - 1] + cost);